3921890372 has 12 divisors (see below), whose sum is σ = 7009336320. Its totient is φ = 1919222856.

The previous prime is 3921890347. The next prime is 3921890387. The reversal of 3921890372 is 2730981293.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10430372 + ... + 10430747.

It is an arithmetic number, because the mean of its divisors is an integer number (584111360).

Almost surely, 2^3921890372 is an apocalyptic number.

It is an amenable number.

3921890372 is a deficient number, since it is larger than the sum of its proper divisors (3087445948).

3921890372 is a wasteful number, since it uses less digits than its factorization.

3921890372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20861170 (or 20861168 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 3921890372 is about 62624.9979800399. The cubic root of 3921890372 is about 1577.0004475398. Note that the first 3 decimals are identical.

The spelling of 3921890372 in words is "three billion, nine hundred twenty-one million, eight hundred ninety thousand, three hundred seventy-two".