13999518 has 48 divisors (see below), whose sum is σ = 33808320. Its totient is φ = 4156992.

The previous prime is 13999481. The next prime is 13999519. The reversal of 13999518 is 81599931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13999519) 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, 5755 + ... + 7817.

It is an arithmetic number, because the mean of its divisors is an integer number (704340).

Almost surely, 2^13999518 is an apocalyptic number.

13999518 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 13999518, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16904160).

13999518 is an abundant number, since it is smaller than the sum of its proper divisors (19808802).

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

13999518 is a wasteful number, since it uses less digits than its factorization.

13999518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2113 (or 2110 counting only the distinct ones).

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

The square root of 13999518 is about 3741.5929762602. The cubic root of 13999518 is about 241.0114604606.

The spelling of 13999518 in words is "thirteen million, nine hundred ninety-nine thousand, five hundred eighteen".