39994000225 has 81 divisors (see below), whose sum is σ = 54439293657. Its totient is φ = 29143414080.

The previous prime is 39994000213. The next prime is 39994000237. The reversal of 39994000225 is 52200049993.

It is a happy number.

The square root of 39994000225 is 199985.

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

It is an interprime number because it is at equal distance from previous prime (39994000213) and next prime (39994000237).

It can be written as a sum of positive squares in 4 ways, for example, as 3796654689 + 36197345536 = 61617^2 + 190256^2 .

It is not a de Polignac number, because 39994000225 - 2²¹ = 39991903073 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 850936152 + ... + 850936198.

Almost surely, 2^39994000225 is an apocalyptic number.

39994000225 is the 199985-th square number.

39994000225 is the 99993-rd centered octagonal number.

It is an amenable number.

39994000225 is a deficient number, since it is larger than the sum of its proper divisors (14445293432).

39994000225 is an equidigital number, since it uses as much as digits as its factorization.

39994000225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 43.

The spelling of 39994000225 in words is "thirty-nine billion, nine hundred ninety-four million, two hundred twenty-five", and thus it is an aban number.