3720385217 has 4 divisors (see below), whose sum is σ = 3882141120. Its totient is φ = 3558629316.

The previous prime is 3720385211. The next prime is 3720385283. The reversal of 3720385217 is 7125830273.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3720385217 - 2²² = 3716190913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3720385211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80877917 + ... + 80877962.

It is an arithmetic number, because the mean of its divisors is an integer number (970535280).

Almost surely, 2^3720385217 is an apocalyptic number.

It is an amenable number.

3720385217 is a deficient number, since it is larger than the sum of its proper divisors (161755903).

3720385217 is a wasteful number, since it uses less digits than its factorization.

3720385217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161755902.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 3720385217 is about 60994.9605869206. The cubic root of 3720385217 is about 1549.5156609499.

The spelling of 3720385217 in words is "three billion, seven hundred twenty million, three hundred eighty-five thousand, two hundred seventeen".