13991814 has 24 divisors (see below), whose sum is σ = 30814992. Its totient is φ = 4587120.

The previous prime is 13991807. The next prime is 13991821. The reversal of 13991814 is 41819931.

It is an interprime number because it is at equal distance from previous prime (13991807) and next prime (13991821).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5274 + ... + 7469.

It is an arithmetic number, because the mean of its divisors is an integer number (1283958).

Almost surely, 2^13991814 is an apocalyptic number.

13991814 is an abundant number, since it is smaller than the sum of its proper divisors (16823178).

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

13991814 is a wasteful number, since it uses less digits than its factorization.

13991814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12812 (or 12809 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 13991814 is about 3740.5633265592. The cubic root of 13991814 is about 240.9672424385.

The spelling of 13991814 in words is "thirteen million, nine hundred ninety-one thousand, eight hundred fourteen".