13937991 has 16 divisors (see below), whose sum is σ = 19450368. Its totient is φ = 8868800.

The previous prime is 13937953. The next prime is 13937999. The reversal of 13937991 is 19973931.

It is a cyclic number.

It is not a de Polignac number, because 13937991 - 2¹⁸ = 13675847 is a prime.

It is a super-3 number, since 3×13937991³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13937999) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4576 + ... + 6986.

It is an arithmetic number, because the mean of its divisors is an integer number (1215648).

Almost surely, 2^13937991 is an apocalyptic number.

13937991 is a deficient number, since it is larger than the sum of its proper divisors (5512377).

13937991 is a wasteful number, since it uses less digits than its factorization.

13937991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2502.

The product of its digits is 45927, while the sum is 42.

The square root of 13937991 is about 3733.3618897717. The cubic root of 13937991 is about 240.6578652136.

The spelling of 13937991 in words is "thirteen million, nine hundred thirty-seven thousand, nine hundred ninety-one".