3939220913 has 4 divisors (see below), whose sum is σ = 3940096368. Its totient is φ = 3938345460.

The previous prime is 3939220877. The next prime is 3939220921. The reversal of 3939220913 is 3190229393.

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 a de Polignac number, because none of the positive numbers 2^k-3939220913 is a prime.

It is a super-2 number, since 2×3939220913² = 31034922802833107138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3939220993) 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, 430943 + ... + 439988.

It is an arithmetic number, because the mean of its divisors is an integer number (985024092).

Almost surely, 2^3939220913 is an apocalyptic number.

It is an amenable number.

3939220913 is a deficient number, since it is larger than the sum of its proper divisors (875455).

3939220913 is an equidigital number, since it uses as much as digits as its factorization.

3939220913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875454.

The product of its (nonzero) digits is 78732, while the sum is 41.

The square root of 3939220913 is about 62763.2130551010. The cubic root of 3939220913 is about 1579.3199168138.

The spelling of 3939220913 in words is "three billion, nine hundred thirty-nine million, two hundred twenty thousand, nine hundred thirteen".