3991357372 has 6 divisors (see below), whose sum is σ = 6984875408. Its totient is φ = 1995678684.

The previous prime is 3991357361. The next prime is 3991357373. The reversal of 3991357372 is 2737531993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991357373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498919668 + ... + 498919675.

Almost surely, 2^3991357372 is an apocalyptic number.

It is an amenable number.

3991357372 is a deficient number, since it is larger than the sum of its proper divisors (2993518036).

3991357372 is a wasteful number, since it uses less digits than its factorization.

3991357372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997839347 (or 997839345 counting only the distinct ones).

The product of its digits is 1071630, while the sum is 49.

The square root of 3991357372 is about 63177.1902825695. The cubic root of 3991357372 is about 1586.2569511707.

The spelling of 3991357372 in words is "three billion, nine hundred ninety-one million, three hundred fifty-seven thousand, three hundred seventy-two".