13991895 has 12 divisors (see below), whose sum is σ = 24252696. Its totient is φ = 7462320.

The previous prime is 13991869. The next prime is 13991897. The reversal of 13991895 is 59819931.

It is not a de Polignac number, because 13991895 - 2⁷ = 13991767 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 310931 = 13991895 / (1 + 3 + 9 + 9 + 1 + 8 + 9 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 13991895.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13991897) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 155421 + ... + 155510.

It is an arithmetic number, because the mean of its divisors is an integer number (2021058).

Almost surely, 2^13991895 is an apocalyptic number.

13991895 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13991895 is a deficient number, since it is larger than the sum of its proper divisors (10260801).

13991895 is a wasteful number, since it uses less digits than its factorization.

13991895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310942 (or 310939 counting only the distinct ones).

The product of its digits is 87480, while the sum is 45.

The square root of 13991895 is about 3740.5741537898. The cubic root of 13991895 is about 240.9677074320.

The spelling of 13991895 in words is "thirteen million, nine hundred ninety-one thousand, eight hundred ninety-five".