13639920 has 160 divisors (see below), whose sum is σ = 50568192. Its totient is φ = 2973696.

The previous prime is 13639919. The next prime is 13639937. The reversal of 13639920 is 2993631.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38464 + ... + 38816.

Almost surely, 2^13639920 is an apocalyptic number.

13639920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13639920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25284096).

13639920 is an abundant number, since it is smaller than the sum of its proper divisors (36928272).

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

13639920 is a wasteful number, since it uses less digits than its factorization.

13639920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 13639920 is about 3693.2262319008. The cubic root of 13639920 is about 238.9299585259.

The spelling of 13639920 in words is "thirteen million, six hundred thirty-nine thousand, nine hundred twenty".