13539988 has 24 divisors (see below), whose sum is σ = 29542464. Its totient is φ = 5275200.

The previous prime is 13539983. The next prime is 13539991. The reversal of 13539988 is 88993531.

13539988 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13539983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21673 + ... + 22288.

It is an arithmetic number, because the mean of its divisors is an integer number (1230936).

Almost surely, 2^13539988 is an apocalyptic number.

It is an amenable number.

13539988 is an abundant number, since it is smaller than the sum of its proper divisors (16002476).

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

13539988 is a wasteful number, since it uses less digits than its factorization.

13539988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43983 (or 43981 counting only the distinct ones).

The product of its digits is 233280, while the sum is 46.

The square root of 13539988 is about 3679.6722680152. The cubic root of 13539988 is about 238.3450260237.

The spelling of 13539988 in words is "thirteen million, five hundred thirty-nine thousand, nine hundred eighty-eight".