400497556 has 12 divisors (see below), whose sum is σ = 723479680. Its totient is φ = 193789080.

The previous prime is 400497533. The next prime is 400497557. The reversal of 400497556 is 655794004.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400497557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1614786 + ... + 1615033.

Almost surely, 2^400497556 is an apocalyptic number.

It is an amenable number.

400497556 is a deficient number, since it is larger than the sum of its proper divisors (322982124).

400497556 is a wasteful number, since it uses less digits than its factorization.

400497556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3229854 (or 3229852 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 400497556 is about 20012.4350342481. The cubic root of 400497556 is about 737.1116751413. Note that the first 3 decimals are identical.

The spelling of 400497556 in words is "four hundred million, four hundred ninety-seven thousand, five hundred fifty-six".