400203664 has 40 divisors (see below), whose sum is σ = 938297088. Its totient is φ = 161425920.

The previous prime is 400203659. The next prime is 400203679. The reversal of 400203664 is 466302004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103192 + ... + 106999.

Almost surely, 2^400203664 is an apocalyptic number.

It is an amenable number.

400203664 is an abundant number, since it is smaller than the sum of its proper divisors (538093424).

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

400203664 is a wasteful number, since it uses less digits than its factorization.

400203664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210223 (or 210217 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 400203664 is about 20005.0909520552. The cubic root of 400203664 is about 736.9313292757.

Adding to 400203664 its reverse (466302004), we get a palindrome (866505668).

The spelling of 400203664 in words is "four hundred million, two hundred three thousand, six hundred sixty-four".