13215888 has 90 divisors (see below), whose sum is σ = 43047654. Its totient is φ = 3773952.

The previous prime is 13215871. The next prime is 13215893. The reversal of 13215888 is 88851231.

It can be written as a sum of positive squares in only one way, i.e., 7683984 + 5531904 = 2772^2 + 2352^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6120 + ... + 7992.

Almost surely, 2^13215888 is an apocalyptic number.

13215888 is a gapful number since it is divisible by the number (18) 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 13215888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21523827).

13215888 is an abundant number, since it is smaller than the sum of its proper divisors (29831766).

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

13215888 is a wasteful number, since it uses less digits than its factorization.

13215888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1901 (or 1885 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 13215888 is about 3635.3662814082. The cubic root of 13215888 is about 236.4279318006.

The spelling of 13215888 in words is "thirteen million, two hundred fifteen thousand, eight hundred eighty-eight".