3991372 has 24 divisors (see below), whose sum is σ = 8709120. Its totient is φ = 1554960.

The previous prime is 3991369. The next prime is 3991399. The reversal of 3991372 is 2731993.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6172 + ... + 6787.

It is an arithmetic number, because the mean of its divisors is an integer number (362880).

Almost surely, 2^3991372 is an apocalyptic number.

It is an amenable number.

3991372 is an abundant number, since it is smaller than the sum of its proper divisors (4717748).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3991372 is a wasteful number, since it uses less digits than its factorization.

3991372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12981 (or 12979 counting only the distinct ones).

The product of its digits is 10206, while the sum is 34.

The square root of 3991372 is about 1997.8418355816. The cubic root of 3991372 is about 158.6258889003.

It can be divided in two parts, 399 and 1372, that added together give a palindrome (1771).

The spelling of 3991372 in words is "three million, nine hundred ninety-one thousand, three hundred seventy-two".