3956721585 has 16 divisors (see below), whose sum is σ = 6360763200. Its totient is φ = 2100248640.

The previous prime is 3956721569. The next prime is 3956721589. The reversal of 3956721585 is 5851276593.

It is a happy number.

3956721585 is nontrivially palindromic in base 12.

It is not a de Polignac number, because 3956721585 - 2⁴ = 3956721569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3956721589) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 621910 + ... + 628239.

It is an arithmetic number, because the mean of its divisors is an integer number (397547700).

Almost surely, 2^3956721585 is an apocalyptic number.

It is an amenable number.

3956721585 is a deficient number, since it is larger than the sum of its proper divisors (2404041615).

3956721585 is a wasteful number, since it uses less digits than its factorization.

3956721585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1250368.

The product of its digits is 2268000, while the sum is 51.

The square root of 3956721585 is about 62902.4767795355. The cubic root of 3956721585 is about 1581.6552626935.

The spelling of 3956721585 in words is "three billion, nine hundred fifty-six million, seven hundred twenty-one thousand, five hundred eighty-five".