400431002 has 4 divisors (see below), whose sum is σ = 600646506. Its totient is φ = 200215500.

The previous prime is 400430941. The next prime is 400431049. The reversal of 400431002 is 200134004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 236821321 + 163609681 = 15389^2 + 12791^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100107749 + ... + 100107752.

Almost surely, 2^400431002 is an apocalyptic number.

400431002 is a deficient number, since it is larger than the sum of its proper divisors (200215504).

400431002 is a wasteful number, since it uses less digits than its factorization.

400431002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200215503.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 400431002 is about 20010.7721490201. The cubic root of 400431002 is about 737.0708422262.

Adding to 400431002 its reverse (200134004), we get a palindrome (600565006).

The spelling of 400431002 in words is "four hundred million, four hundred thirty-one thousand, two".