39645190321 has 27 divisors (see below), whose sum is σ = 45611927193. Its totient is φ = 34430274120.

The previous prime is 39645190309. The next prime is 39645190363. The reversal of 39645190321 is 12309154693.

It is a happy number.

The square root of 39645190321 is 199111.

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

It is a de Polignac number, because none of the positive numbers 2^k-39645190321 is a prime.

It is a super-2 number, since 2×39645190321² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39645190121) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 50374690 + ... + 50375476.

Almost surely, 2^39645190321 is an apocalyptic number.

39645190321 is the 199111-st square number.

39645190321 is the 99556-th centered octagonal number.

It is an amenable number.

39645190321 is a deficient number, since it is larger than the sum of its proper divisors (5966736872).

39645190321 is an frugal number, since it uses more digits than its factorization.

39645190321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642 (or 821 counting only the distinct ones).

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

The spelling of 39645190321 in words is "thirty-nine billion, six hundred forty-five million, one hundred ninety thousand, three hundred twenty-one".