13991285 has 16 divisors (see below), whose sum is σ = 20932992. Its totient is φ = 8721600.

The previous prime is 13991281. The next prime is 13991287. The reversal of 13991285 is 58219931.

It is not a de Polignac number, because 13991285 - 2² = 13991281 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13991281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17786 + ... + 18555.

It is an arithmetic number, because the mean of its divisors is an integer number (1308312).

Almost surely, 2^13991285 is an apocalyptic number.

It is an amenable number.

13991285 is a deficient number, since it is larger than the sum of its proper divisors (6941707).

13991285 is a wasteful number, since it uses less digits than its factorization.

13991285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36364.

The product of its digits is 19440, while the sum is 38.

The square root of 13991285 is about 3740.4926146164. The cubic root of 13991285 is about 240.9642055848.

The spelling of 13991285 in words is "thirteen million, nine hundred ninety-one thousand, two hundred eighty-five".