3991522900 has 18 divisors (see below), whose sum is σ = 8661604910. Its totient is φ = 1596609120.

The previous prime is 3991522877. The next prime is 3991522901. The reversal of 3991522900 is 92251993.

It can be written as a sum of positive squares in 3 ways, for example, as 39891856 + 3951631044 = 6316^2 + 62862^2 .

It is a super-2 number, since 2×3991522900² = 31864510122448820000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991522901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19957515 + ... + 19957714.

Almost surely, 2^3991522900 is an apocalyptic number.

It is an amenable number.

3991522900 is an abundant number, since it is smaller than the sum of its proper divisors (4670082010).

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

3991522900 is a wasteful number, since it uses less digits than its factorization.

3991522900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39915243 (or 39915236 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 3991522900 is about 63178.5002987567. The cubic root of 3991522900 is about 1586.2788790753.

The spelling of 3991522900 in words is "three billion, nine hundred ninety-one million, five hundred twenty-two thousand, nine hundred".