13991268 has 48 divisors (see below), whose sum is σ = 34384896. Its totient is φ = 4419360.

The previous prime is 13991251. The next prime is 13991273. The reversal of 13991268 is 86219931.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44833 + ... + 45143.

It is an arithmetic number, because the mean of its divisors is an integer number (716352).

Almost surely, 2^13991268 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13991268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17192448).

13991268 is an abundant number, since it is smaller than the sum of its proper divisors (20393628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13991268 is a wasteful number, since it uses less digits than its factorization.

13991268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504 (or 502 counting only the distinct ones).

The product of its digits is 23328, while the sum is 39.

The square root of 13991268 is about 3740.4903421878. The cubic root of 13991268 is about 240.9641079909.

The spelling of 13991268 in words is "thirteen million, nine hundred ninety-one thousand, two hundred sixty-eight".