31800004 has 6 divisors (see below), whose sum is σ = 55650014. Its totient is φ = 15900000.

The previous prime is 31799993. The next prime is 31800011. The reversal of 31800004 is 40000813.

It can be written as a sum of positive squares in only one way, i.e., 31337604 + 462400 = 5598^2 + 680^2 .

It is a super-2 number, since 2×31800004² = 2022480508800032, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3974997 + ... + 3975004.

Almost surely, 2^31800004 is an apocalyptic number.

It is an amenable number.

31800004 is a deficient number, since it is larger than the sum of its proper divisors (23850010).

31800004 is a wasteful number, since it uses less digits than its factorization.

31800004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7950005 (or 7950003 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 31800004 is about 5639.1492266121. The cubic root of 31800004 is about 316.8174238155.

Adding to 31800004 its reverse (40000813), we get a palindrome (71800817).

The spelling of 31800004 in words is "thirty-one million, eight hundred thousand, four".