39990000625 has 45 divisors (see below), whose sum is σ = 52865579943. Its totient is φ = 30236220000.

The previous prime is 39990000607. The next prime is 39990000637. The reversal of 39990000625 is 52600009993.

The square root of 39990000625 is 199975.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 38172172129 + 1817828496 = 195377^2 + 42636^2 .

It is not a de Polignac number, because 39990000625 - 2¹¹ = 39989998577 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 94987915 + ... + 94988335.

Almost surely, 2^39990000625 is an apocalyptic number.

39990000625 is the 199975-th square number.

39990000625 is the 99988-th centered octagonal number.

It is an amenable number.

39990000625 is a deficient number, since it is larger than the sum of its proper divisors (12875579318).

39990000625 is an frugal number, since it uses more digits than its factorization.

39990000625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900 (or 445 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 43.

The spelling of 39990000625 in words is "thirty-nine billion, nine hundred ninety million, six hundred twenty-five", and thus it is an aban number.