13974991 has 2 divisors, whose sum is σ = 13974992. Its totient is φ = 13974990.

The previous prime is 13974979. The next prime is 13974997. The reversal of 13974991 is 19947931.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13974991 - 2¹¹ = 13972943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13974997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6987495 + 6987496.

It is an arithmetic number, because the mean of its divisors is an integer number (6987496).

Almost surely, 2^13974991 is an apocalyptic number.

13974991 is a deficient number, since it is larger than the sum of its proper divisors (1).

13974991 is an equidigital number, since it uses as much as digits as its factorization.

13974991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 43.

The square root of 13974991 is about 3738.3139247527. The cubic root of 13974991 is about 240.8706283828.

The spelling of 13974991 in words is "thirteen million, nine hundred seventy-four thousand, nine hundred ninety-one".