400942278 has 32 divisors (see below), whose sum is σ = 971982720. Its totient is φ = 121497480.

The previous prime is 400942211. The next prime is 400942309. The reversal of 400942278 is 872249004.

It is a congruent number.

It is an unprimeable number.

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, 336900 + ... + 338087.

It is an arithmetic number, because the mean of its divisors is an integer number (30374460).

Almost surely, 2^400942278 is an apocalyptic number.

400942278 is an abundant number, since it is smaller than the sum of its proper divisors (571040442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400942278 is a wasteful number, since it uses less digits than its factorization.

400942278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675009 (or 675003 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 400942278 is about 20023.5430930692. The cubic root of 400942278 is about 737.3844096540.

The spelling of 400942278 in words is "four hundred million, nine hundred forty-two thousand, two hundred seventy-eight".