3811721925 has 24 divisors (see below), whose sum is σ = 6874961760. Its totient is φ = 1848107200.

The previous prime is 3811721891. The next prime is 3811721957. The reversal of 3811721925 is 5291271183.

It is a happy number.

It is not a de Polignac number, because 3811721925 - 2¹² = 3811717829 is a prime.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2309310 + ... + 2310959.

It is an arithmetic number, because the mean of its divisors is an integer number (286456740).

Almost surely, 2^3811721925 is an apocalyptic number.

It is an amenable number.

3811721925 is a deficient number, since it is larger than the sum of its proper divisors (3063239835).

3811721925 is a wasteful number, since it uses less digits than its factorization.

3811721925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4620293 (or 4620288 counting only the distinct ones).

The product of its digits is 30240, while the sum is 39.

The square root of 3811721925 is about 61739.1441874602. The cubic root of 3811721925 is about 1562.0936611646.

The spelling of 3811721925 in words is "three billion, eight hundred eleven million, seven hundred twenty-one thousand, nine hundred twenty-five".