402978384 has 30 divisors (see below), whose sum is σ = 1127780186. Its totient is φ = 134326080.

The previous prime is 402978349. The next prime is 402978419. The reversal of 402978384 is 483879204.

402978384 is a `hidden beast` number, since 402 + 97 + 83 + 84 = 666.

It is an interprime number because it is at equal distance from previous prime (402978349) and next prime (402978419).

It can be written as a sum of positive squares in only one way, i.e., 231891984 + 171086400 = 15228^2 + 13080^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1399087 + ... + 1399374.

Almost surely, 2^402978384 is an apocalyptic number.

It is an amenable number.

402978384 is an abundant number, since it is smaller than the sum of its proper divisors (724801802).

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

402978384 is a wasteful number, since it uses less digits than its factorization.

402978384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2798475 (or 2798466 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 402978384 is about 20074.3215078368. The cubic root of 402978384 is about 738.6305229063.

The spelling of 402978384 in words is "four hundred two million, nine hundred seventy-eight thousand, three hundred eighty-four".