402978 has 16 divisors (see below), whose sum is σ = 823680. Its totient is φ = 131376.

The previous prime is 402949. The next prime is 402991. The reversal of 402978 is 879204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 433 + ... + 996.

It is an arithmetic number, because the mean of its divisors is an integer number (51480).

2⁴⁰²⁹⁷⁸ is an apocalyptic number.

402978 is an abundant number, since it is smaller than the sum of its proper divisors (420702).

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

402978 is a wasteful number, since it uses less digits than its factorization.

402978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 402978 is about 634.8054820179. The cubic root of 402978 is about 73.8630288291.

The spelling of 402978 in words is "four hundred two thousand, nine hundred seventy-eight".