6991372 has 24 divisors (see below), whose sum is σ = 12721184. Its totient is φ = 3359232.

The previous prime is 6991363. The next prime is 6991381. The reversal of 6991372 is 2731996.

It is an interprime number because it is at equal distance from previous prime (6991363) and next prime (6991381).

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14113 + ... + 14599.

Almost surely, 2^6991372 is an apocalyptic number.

It is an amenable number.

6991372 is a deficient number, since it is larger than the sum of its proper divisors (5729812).

6991372 is a wasteful number, since it uses less digits than its factorization.

6991372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625 (or 623 counting only the distinct ones).

The product of its digits is 20412, while the sum is 37.

The square root of 6991372 is about 2644.1202695793. The cubic root of 6991372 is about 191.2144918201.

The spelling of 6991372 in words is "six million, nine hundred ninety-one thousand, three hundred seventy-two".