400042432 has 28 divisors (see below), whose sum is σ = 798444936. Its totient is φ = 198859520.

The previous prime is 400042369. The next prime is 400042441. The reversal of 400042432 is 234240004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6994 + ... + 29137.

Almost surely, 2^400042432 is an apocalyptic number.

It is an amenable number.

400042432 is a deficient number, since it is larger than the sum of its proper divisors (398402504).

400042432 is a wasteful number, since it uses less digits than its factorization.

400042432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36316 (or 36306 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 400042432 is about 20001.0607718691. The cubic root of 400042432 is about 736.8323522776.

Adding to 400042432 its reverse (234240004), we get a palindrome (634282436).

It can be divided in two parts, 40004 and 2432, that added together give a square (42436 = 206²).

The spelling of 400042432 in words is "four hundred million, forty-two thousand, four hundred thirty-two".