39990025 has 6 divisors (see below), whose sum is σ = 49587662. Its totient is φ = 31992000.

The previous prime is 39990019. The next prime is 39990107. The reversal of 39990025 is 52009993.

It can be written as a sum of positive squares in 3 ways, for example, as 7420176 + 32569849 = 2724^2 + 5707^2 .

It is not a de Polignac number, because 39990025 - 2³ = 39990017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 799776 + ... + 799825.

Almost surely, 2^39990025 is an apocalyptic number.

It is an amenable number.

39990025 is a deficient number, since it is larger than the sum of its proper divisors (9597637).

39990025 is a wasteful number, since it uses less digits than its factorization.

39990025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1599611 (or 1599606 counting only the distinct ones).

The product of its (nonzero) digits is 21870, while the sum is 37.

The square root of 39990025 is about 6323.7666781753. The cubic root of 39990025 is about 341.9667586218.

The spelling of 39990025 in words is "thirty-nine million, nine hundred ninety thousand, twenty-five".