3991324004 has 6 divisors (see below), whose sum is σ = 6984817014. Its totient is φ = 1995662000.

The previous prime is 3991323991. The next prime is 3991324069. The reversal of 3991324004 is 4004231993.

It can be written as a sum of positive squares in only one way, i.e., 2277198400 + 1714125604 = 47720^2 + 41402^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498915497 + ... + 498915504.

It is an arithmetic number, because the mean of its divisors is an integer number (1164136169).

Almost surely, 2^3991324004 is an apocalyptic number.

It is an amenable number.

3991324004 is a deficient number, since it is larger than the sum of its proper divisors (2993493010).

3991324004 is a wasteful number, since it uses less digits than its factorization.

3991324004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997831005 (or 997831003 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 3991324004 is about 63176.9261993649. The cubic root of 3991324004 is about 1586.2525307556.

Adding to 3991324004 its reverse (4004231993), we get a palindrome (7995555997).

The spelling of 3991324004 in words is "three billion, nine hundred ninety-one million, three hundred twenty-four thousand, four".