400649432 has 16 divisors (see below), whose sum is σ = 767201760. Its totient is φ = 196062304.

The previous prime is 400649423. The next prime is 400649437. The reversal of 400649432 is 234946004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400649437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532403 + ... + 533154.

It is an arithmetic number, because the mean of its divisors is an integer number (47950110).

Almost surely, 2^400649432 is an apocalyptic number.

It is an amenable number.

400649432 is a deficient number, since it is larger than the sum of its proper divisors (366552328).

400649432 is a wasteful number, since it uses less digits than its factorization.

400649432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065610 (or 1065606 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 400649432 is about 20016.2292153143. The cubic root of 400649432 is about 737.2048387765.

The spelling of 400649432 in words is "four hundred million, six hundred forty-nine thousand, four hundred thirty-two".