13939191 has 24 divisors (see below), whose sum is σ = 23258144. Its totient is φ = 7879680.

The previous prime is 13939187. The next prime is 13939193. The reversal of 13939191 is 19193931.

It is not a de Polignac number, because 13939191 - 2² = 13939187 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13939193) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4971 + ... + 7251.

Almost surely, 2^13939191 is an apocalyptic number.

13939191 is a deficient number, since it is larger than the sum of its proper divisors (9318953).

13939191 is a wasteful number, since it uses less digits than its factorization.

13939191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2391 (or 2388 counting only the distinct ones).

The product of its digits is 6561, while the sum is 36.

The square root of 13939191 is about 3733.5225993691. The cubic root of 13939191 is about 240.6647715449.

The spelling of 13939191 in words is "thirteen million, nine hundred thirty-nine thousand, one hundred ninety-one".