400432420 has 24 divisors (see below), whose sum is σ = 842071104. Its totient is φ = 159951456.

The previous prime is 400432387. The next prime is 400432423. The reversal of 400432420 is 24234004.

It is a super-2 number, since 2×400432420² = 320692245974112800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (400432423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1387 + ... + 28333.

It is an arithmetic number, because the mean of its divisors is an integer number (35086296).

Almost surely, 2^400432420 is an apocalyptic number.

It is an amenable number.

400432420 is an abundant number, since it is smaller than the sum of its proper divisors (441638684).

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

400432420 is a wasteful number, since it uses less digits than its factorization.

400432420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27699 (or 27697 counting only the distinct ones).

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

The square root of 400432420 is about 20010.8075799054. The cubic root of 400432420 is about 737.0717122597.

Adding to 400432420 its reverse (24234004), we get a palindrome (424666424).

The spelling of 400432420 in words is "four hundred million, four hundred thirty-two thousand, four hundred twenty".