1440430209 has 15 divisors (see below), whose sum is σ = 2152264147. Its totient is φ = 960059088.

The previous prime is 1440430151. The next prime is 1440430219. The reversal of 1440430209 is 9020340441.

The square root of 1440430209 is 37953.

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

It can be written as a sum of positive squares in only one way, i.e., 1279850625 + 160579584 = 35775^2 + 12672^2 .

It is not a de Polignac number, because 1440430209 - 2²³ = 1432041601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1440430219) 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, 339469 + ... + 343685.

Almost surely, 2^1440430209 is an apocalyptic number.

1440430209 is the 37953-rd square number.

1440430209 is the 18977-th centered octagonal number.

It is an amenable number.

1440430209 is a deficient number, since it is larger than the sum of its proper divisors (711833938).

1440430209 is an frugal number, since it uses more digits than its factorization.

1440430209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8446 (or 4220 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The cubic root of 1440430209 is about 1129.3556796181.

It can be divided in two parts, 1440 and 430209, that added together give a square (431649 = 657²).

The spelling of 1440430209 in words is "one billion, four hundred forty million, four hundred thirty thousand, two hundred nine".