3697375721 has 8 divisors (see below), whose sum is σ = 3982823880. Its totient is φ = 3412075392.

The previous prime is 3697375711. The next prime is 3697375727. The reversal of 3697375721 is 1275737963.

3697375721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 457489321 + 3239886400 = 21389^2 + 56920^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3697375721 - 2¹⁰ = 3697374697 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3697375721.

It is not an unprimeable number, because it can be changed into a prime (3697375727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18035 + ... + 87863.

It is an arithmetic number, because the mean of its divisors is an integer number (497852985).

Almost surely, 2^3697375721 is an apocalyptic number.

It is an amenable number.

3697375721 is a deficient number, since it is larger than the sum of its proper divisors (285448159).

3697375721 is a wasteful number, since it uses less digits than its factorization.

3697375721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73915.

The product of its digits is 1666980, while the sum is 50.

The square root of 3697375721 is about 60806.0500361601. The cubic root of 3697375721 is about 1546.3146187433.

The spelling of 3697375721 in words is "three billion, six hundred ninety-seven million, three hundred seventy-five thousand, seven hundred twenty-one".