400002464 has 12 divisors (see below), whose sum is σ = 787504914. Its totient is φ = 200001216.

The previous prime is 400002461. The next prime is 400002509. The reversal of 400002464 is 464200004.

It can be written as a sum of positive squares in only one way, i.e., 342546064 + 57456400 = 18508^2 + 7580^2 .

It is not an unprimeable number, because it can be changed into a prime (400002461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6250007 + ... + 6250070.

Almost surely, 2^400002464 is an apocalyptic number.

It is an amenable number.

400002464 is a deficient number, since it is larger than the sum of its proper divisors (387502450).

400002464 is a wasteful number, since it uses less digits than its factorization.

400002464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12500087 (or 12500079 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 400002464 is about 20000.0615999051. The cubic root of 400002464 is about 736.8078126339.

Adding to 400002464 its reverse (464200004), we get a palindrome (864202468).

The spelling of 400002464 in words is "four hundred million, two thousand, four hundred sixty-four".