13239988 has 6 divisors (see below), whose sum is σ = 23169986. Its totient is φ = 6619992.

The previous prime is 13239949. The next prime is 13239997. The reversal of 13239988 is 88993231.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13118884 + 121104 = 3622^2 + 348^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1654995 + ... + 1655002.

Almost surely, 2^13239988 is an apocalyptic number.

It is an amenable number.

13239988 is a deficient number, since it is larger than the sum of its proper divisors (9929998).

13239988 is a wasteful number, since it uses less digits than its factorization.

13239988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3310001 (or 3309999 counting only the distinct ones).

The product of its digits is 93312, while the sum is 43.

The square root of 13239988 is about 3638.6794307825. The cubic root of 13239988 is about 236.5715582488.

It can be divided in two parts, 1323 and 9988, that added together give a palindrome (11311).

The spelling of 13239988 in words is "thirteen million, two hundred thirty-nine thousand, nine hundred eighty-eight".