400120432 has 20 divisors (see below), whose sum is σ = 820835856. Its totient is φ = 188291840.

The previous prime is 400120423. The next prime is 400120481. The reversal of 400120432 is 234021004.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 735244 + ... + 735787.

Almost surely, 2^400120432 is an apocalyptic number.

It is an amenable number.

400120432 is an abundant number, since it is smaller than the sum of its proper divisors (420715424).

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

400120432 is a wasteful number, since it uses less digits than its factorization.

400120432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471056 (or 1471050 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 400120432 is about 20003.0105734112. The cubic root of 400120432 is about 736.8802381884.

Adding to 400120432 its reverse (234021004), we get a palindrome (634141436).

The spelling of 400120432 in words is "four hundred million, one hundred twenty thousand, four hundred thirty-two".