39995012353921 has 9 divisors (see below), whose sum is σ = 40034013486249. Its totient is φ = 39956049198000.

The previous prime is 39995012353889. The next prime is 39995012353927. The reversal of 39995012353921 is 12935321059993.

The square root of 39995012353921 is 6324161.

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

It can be written as a sum of positive squares in 4 ways, for example, as 2422035451521 + 37572976902400 = 1556289^2 + 6129680^2 .

It is not a de Polignac number, because 39995012353921 - 2⁵ = 39995012353889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39995012353921.

It is not an unprimeable number, because it can be changed into a prime (39995012353927) by changing a digit.

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 8 ways as a sum of consecutive naturals, for example, 8227731031 + ... + 8227735891.

Almost surely, 2^{39995012353921} is an apocalyptic number.

39995012353921 is the 6324161-st square number.

39995012353921 is the 3162081-st centered octagonal number.

It is an amenable number.

39995012353921 is a deficient number, since it is larger than the sum of its proper divisors (39001132328).

39995012353921 is an frugal number, since it uses more digits than its factorization.

39995012353921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12324 (or 6162 counting only the distinct ones).

The product of its (nonzero) digits is 17714700, while the sum is 61.

The spelling of 39995012353921 in words is "thirty-nine trillion, nine hundred ninety-five billion, twelve million, three hundred fifty-three thousand, nine hundred twenty-one".