3752115721 has 16 divisors (see below), whose sum is σ = 3985182208. Its totient is φ = 3526416000.

The previous prime is 3752115683. The next prime is 3752115739. The reversal of 3752115721 is 1275112573.

It is a cyclic number.

It is not a de Polignac number, because 3752115721 - 2⁷ = 3752115593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3752115751) 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, 686626 + ... + 692068.

It is an arithmetic number, because the mean of its divisors is an integer number (249073888).

Almost surely, 2^3752115721 is an apocalyptic number.

3752115721 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3752115721 is a deficient number, since it is larger than the sum of its proper divisors (233066487).

3752115721 is a wasteful number, since it uses less digits than its factorization.

3752115721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6112.

The product of its digits is 14700, while the sum is 34.

The square root of 3752115721 is about 61254.5159233178. The cubic root of 3752115721 is about 1553.9083774708.

The spelling of 3752115721 in words is "three billion, seven hundred fifty-two million, one hundred fifteen thousand, seven hundred twenty-one".