400252912539 has 16 divisors (see below), whose sum is σ = 535564319904. Its totient is φ = 265889792000.

The previous prime is 400252912531. The next prime is 400252912561. The reversal of 400252912539 is 935219252004.

It is a cyclic number.

It is not a de Polignac number, because 400252912539 - 2³ = 400252912531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400252912539.

It is not an unprimeable number, because it can be changed into a prime (400252912531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 971899 + ... + 1321019.

It is an arithmetic number, because the mean of its divisors is an integer number (33472769994).

Almost surely, 2^400252912539 is an apocalyptic number.

400252912539 is a deficient number, since it is larger than the sum of its proper divisors (135311407365).

400252912539 is a wasteful number, since it uses less digits than its factorization.

400252912539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350478.

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 400252912539 in words is "four hundred billion, two hundred fifty-two million, nine hundred twelve thousand, five hundred thirty-nine".