13599990 has 48 divisors (see below), whose sum is σ = 35650368. Its totient is φ = 3596928.

The previous prime is 13599893. The next prime is 13600003. The reversal of 13599990 is 9999531.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11779 + ... + 12881.

It is an arithmetic number, because the mean of its divisors is an integer number (742716).

Almost surely, 2^13599990 is an apocalyptic number.

13599990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 13599990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17825184).

13599990 is an abundant number, since it is smaller than the sum of its proper divisors (22050378).

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

13599990 is a wasteful number, since it uses less digits than its factorization.

13599990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1253 (or 1250 counting only the distinct ones).

The product of its (nonzero) digits is 98415, while the sum is 45.

The square root of 13599990 is about 3687.8164271015. The cubic root of 13599990 is about 238.6965798814.

The spelling of 13599990 in words is "thirteen million, five hundred ninety-nine thousand, nine hundred ninety".