1242774009 has 15 divisors (see below), whose sum is σ = 1856963647. Its totient is φ = 828304488.

The previous prime is 1242774007. The next prime is 1242774011. The reversal of 1242774009 is 9004772421.

The square root of 1242774009 is 35253.

It is a perfect power (a square), and thus also a powerful number.

1242774009 is a `hidden beast` number, since 1 + 242 + 7 + 7 + 400 + 9 = 666.

1242774009 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1242774007) and next prime (1242774011).

It can be written as a sum of positive squares in only one way, i.e., 1006475625 + 236298384 = 31725^2 + 15372^2 .

It is not a de Polignac number, because 1242774009 - 2¹ = 1242774007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242774007) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 315319 + ... + 319235.

Almost surely, 2^1242774009 is an apocalyptic number.

1242774009 is the 35253-rd square number.

1242774009 is the 17627-th centered octagonal number.

It is an amenable number.

1242774009 is a deficient number, since it is larger than the sum of its proper divisors (614189638).

1242774009 is an frugal number, since it uses more digits than its factorization.

1242774009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7846 (or 3920 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The cubic root of 1242774009 is about 1075.1376089210.

Multiplying 1242774009 by its sum of digits (36), we get a square (44739864324 = 211518²).

Multiplying 1242774009 by its product of nonzero digits (28224), we get a square (35076053630016 = 5922504²).

It can be divided in two parts, 12427 and 74009, that added together give a square (86436 = 294²).

The spelling of 1242774009 in words is "one billion, two hundred forty-two million, seven hundred seventy-four thousand, nine".