39821791325 has 12 divisors (see below), whose sum is σ = 49634877108. Its totient is φ = 31692364800.

The previous prime is 39821791291. The next prime is 39821791349. The reversal of 39821791325 is 52319712893.

It can be written as a sum of positive squares in 6 ways, for example, as 5427121561 + 34394669764 = 73669^2 + 185458^2 .

It is not a de Polignac number, because 39821791325 - 2²⁰ = 39820742749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4121786 + ... + 4131435.

It is an arithmetic number, because the mean of its divisors is an integer number (4136239759).

Almost surely, 2^39821791325 is an apocalyptic number.

It is an amenable number.

39821791325 is a deficient number, since it is larger than the sum of its proper divisors (9813085783).

39821791325 is a wasteful number, since it uses less digits than its factorization.

39821791325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8253424 (or 8253419 counting only the distinct ones).

The product of its digits is 816480, while the sum is 50.

The spelling of 39821791325 in words is "thirty-nine billion, eight hundred twenty-one million, seven hundred ninety-one thousand, three hundred twenty-five".