13281990 has 16 divisors (see below), whose sum is σ = 31876848. Its totient is φ = 3541856.

The previous prime is 13281973. The next prime is 13282019. The reversal of 13281990 is 9918231.

13281990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×13281990² = 352822516720200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221337 + ... + 221396.

It is an arithmetic number, because the mean of its divisors is an integer number (1992303).

Almost surely, 2^13281990 is an apocalyptic number.

13281990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13281990 is an abundant number, since it is smaller than the sum of its proper divisors (18594858).

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

13281990 is a wasteful number, since it uses less digits than its factorization.

13281990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442743.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 13281990 is about 3644.4464600265. The cubic root of 13281990 is about 236.8214575112.

The spelling of 13281990 in words is "thirteen million, two hundred eighty-one thousand, nine hundred ninety".