1242820899 has 24 divisors (see below), whose sum is σ = 1829256000. Its totient is φ = 812879280.

The previous prime is 1242820889. The next prime is 1242820933. The reversal of 1242820899 is 9980282421.

It is a happy number.

1242820899 is a `hidden beast` number, since 12 + 428 + 208 + 9 + 9 = 666.

It is not a de Polignac number, because 1242820899 - 2⁴ = 1242820883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1242820879) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 301152 + ... + 305250.

It is an arithmetic number, because the mean of its divisors is an integer number (76219000).

Almost surely, 2^1242820899 is an apocalyptic number.

1242820899 is a deficient number, since it is larger than the sum of its proper divisors (586435101).

1242820899 is a wasteful number, since it uses less digits than its factorization.

1242820899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4735 (or 4732 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 1242820899 is about 35253.6650435100. The cubic root of 1242820899 is about 1075.1511304377.

The spelling of 1242820899 in words is "one billion, two hundred forty-two million, eight hundred twenty thousand, eight hundred ninety-nine".