3999001625 has 32 divisors (see below), whose sum is σ = 5250903840. Its totient is φ = 3036672000.

The previous prime is 3999001609. The next prime is 3999001663. The reversal of 3999001625 is 5261009993.

It can be written as a sum of positive squares in 16 ways, for example, as 1719512089 + 2279489536 = 41467^2 + 47744^2 .

It is not a de Polignac number, because 3999001625 - 2⁴ = 3999001609 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 179081 + ... + 200169.

It is an arithmetic number, because the mean of its divisors is an integer number (164090745).

Almost surely, 2^3999001625 is an apocalyptic number.

It is an amenable number.

3999001625 is a deficient number, since it is larger than the sum of its proper divisors (1251902215).

3999001625 is a wasteful number, since it uses less digits than its factorization.

3999001625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21182 (or 21172 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 44.

The square root of 3999001625 is about 63237.6598634073. The cubic root of 3999001625 is about 1587.2689725184.

The spelling of 3999001625 in words is "three billion, nine hundred ninety-nine million, one thousand, six hundred twenty-five".