402363978 has 16 divisors (see below), whose sum is σ = 839716416. Its totient is φ = 128289920.

The previous prime is 402363967. The next prime is 402364003. The reversal of 402363978 is 879363204.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1457703 + ... + 1457978.

It is an arithmetic number, because the mean of its divisors is an integer number (52482276).

Almost surely, 2^402363978 is an apocalyptic number.

402363978 is an abundant number, since it is smaller than the sum of its proper divisors (437352438).

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

402363978 is a wasteful number, since it uses less digits than its factorization.

402363978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2915709.

The product of its (nonzero) digits is 217728, while the sum is 42.

The square root of 402363978 is about 20059.0123884502. The cubic root of 402363978 is about 738.2549445636.

The spelling of 402363978 in words is "four hundred two million, three hundred sixty-three thousand, nine hundred seventy-eight".