400939457 has 16 divisors (see below), whose sum is σ = 415180800. Its totient is φ = 387026640.

The previous prime is 400939453. The next prime is 400939477. The reversal of 400939457 is 754939004.

It is a cyclic number.

It is not a de Polignac number, because 400939457 - 2² = 400939453 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400939453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1116644 + ... + 1117002.

It is an arithmetic number, because the mean of its divisors is an integer number (25948800).

Almost surely, 2^400939457 is an apocalyptic number.

It is an amenable number.

400939457 is a deficient number, since it is larger than the sum of its proper divisors (14241343).

400939457 is a wasteful number, since it uses less digits than its factorization.

400939457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 400939457 is about 20023.4726508665. The cubic root of 400939457 is about 737.3826802560.

The spelling of 400939457 in words is "four hundred million, nine hundred thirty-nine thousand, four hundred fifty-seven".