400978612 has 12 divisors (see below), whose sum is σ = 718031776. Its totient is φ = 195826680.

The previous prime is 400978597. The next prime is 400978637. The reversal of 400978612 is 216879004.

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 3 ways as a sum of consecutive naturals, for example, 1165464 + ... + 1165807.

Almost surely, 2^400978612 is an apocalyptic number.

It is an amenable number.

400978612 is a deficient number, since it is larger than the sum of its proper divisors (317053164).

400978612 is a wasteful number, since it uses less digits than its factorization.

400978612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2331318 (or 2331316 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 400978612 is about 20024.4503545041. The cubic root of 400978612 is about 737.4066832806.

It can be divided in two parts, 4009 and 78612, that added together give a triangular number (82621 = T₄₀₆).

The spelling of 400978612 in words is "four hundred million, nine hundred seventy-eight thousand, six hundred twelve".