12973991 has 8 divisors (see below), whose sum is σ = 13461600. Its totient is φ = 12489120.

The previous prime is 12973981. The next prime is 12974011. The reversal of 12973991 is 19937921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12973991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12973921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17945 + ... + 18653.

It is an arithmetic number, because the mean of its divisors is an integer number (1682700).

Almost surely, 2^12973991 is an apocalyptic number.

12973991 is a deficient number, since it is larger than the sum of its proper divisors (487609).

12973991 is an equidigital number, since it uses as much as digits as its factorization.

12973991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369.

The product of its digits is 30618, while the sum is 41.

The square root of 12973991 is about 3601.9426702822. The cubic root of 12973991 is about 234.9765541721.

The spelling of 12973991 in words is "twelve million, nine hundred seventy-three thousand, nine hundred ninety-one".