39998000025 has 81 divisors (see below), whose sum is σ = 73093382271. Its totient is φ = 20908277280.

The previous prime is 39997999957. The next prime is 39998000041. The reversal of 39998000025 is 52000089993.

The square root of 39998000025 is 199995.

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

It can be written as a sum of positive squares in only one way, i.e., 14399280009 + 25598720016 = 119997^2 + 159996^2 .

It is not a de Polignac number, because 39998000025 - 2⁷ = 39997999897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 200994876 + ... + 200995074.

Almost surely, 2^39998000025 is an apocalyptic number.

39998000025 is the 199995-th square number.

39998000025 is the 99998-th centered octagonal number.

It is an amenable number.

39998000025 is a deficient number, since it is larger than the sum of its proper divisors (33095382246).

39998000025 is an equidigital number, since it uses as much as digits as its factorization.

39998000025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The spelling of 39998000025 in words is "thirty-nine billion, nine hundred ninety-eight million, twenty-five", and thus it is an aban number.