3925919221 has 16 divisors (see below), whose sum is σ = 4593685888. Its totient is φ = 3284971200.

The previous prime is 3925919189. The next prime is 3925919269. The reversal of 3925919221 is 1229195293.

It is a happy number.

It is not a de Polignac number, because 3925919221 - 2⁵ = 3925919189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3925919321) 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, 919231 + ... + 923491.

It is an arithmetic number, because the mean of its divisors is an integer number (287105368).

Almost surely, 2^3925919221 is an apocalyptic number.

It is an amenable number.

3925919221 is a deficient number, since it is larger than the sum of its proper divisors (667766667).

3925919221 is a wasteful number, since it uses less digits than its factorization.

3925919221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7372.

The product of its digits is 87480, while the sum is 43.

The square root of 3925919221 is about 62657.1561834720. The cubic root of 3925919221 is about 1577.5402656483.

The spelling of 3925919221 in words is "three billion, nine hundred twenty-five million, nine hundred nineteen thousand, two hundred twenty-one".