400666004 has 12 divisors (see below), whose sum is σ = 701399328. Its totient is φ = 200266200.

The previous prime is 400665997. The next prime is 400666009.

400666004 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×400666004² = 321066493522656032, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400666009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1712 + ... + 28359.

It is an arithmetic number, because the mean of its divisors is an integer number (58449944).

Almost surely, 2^400666004 is an apocalyptic number.

It is an amenable number.

400666004 is a deficient number, since it is larger than the sum of its proper divisors (300733324).

400666004 is a wasteful number, since it uses less digits than its factorization.

400666004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33406 (or 33404 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 400666004 is about 20016.6431751180. The cubic root of 400666004 is about 737.2150029327.

The spelling of 400666004 in words is "four hundred million, six hundred sixty-six thousand, four".