3253985721 has 24 divisors (see below), whose sum is σ = 5473016640. Its totient is φ = 1824335136.

The previous prime is 3253985677. The next prime is 3253985737. The reversal of 3253985721 is 1275893523.

3253985721 is a `hidden beast` number, since 32 + 539 + 85 + 7 + 2 + 1 = 666.

It is not a de Polignac number, because 3253985721 - 2¹⁷ = 3253854649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3253983721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 483931 + ... + 490608.

It is an arithmetic number, because the mean of its divisors is an integer number (228042360).

Almost surely, 2^3253985721 is an apocalyptic number.

It is an amenable number.

3253985721 is a deficient number, since it is larger than the sum of its proper divisors (2219030919).

3253985721 is a wasteful number, since it uses less digits than its factorization.

3253985721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974605 (or 974602 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 3253985721 is about 57043.7176295515. The cubic root of 3253985721 is about 1481.8533090341.

The spelling of 3253985721 in words is "three billion, two hundred fifty-three million, nine hundred eighty-five thousand, seven hundred twenty-one".