13243990 has 16 divisors (see below), whose sum is σ = 23895648. Its totient is φ = 5285056.

The previous prime is 13243973. The next prime is 13243991. The reversal of 13243990 is 9934231.

It is a super-2 number, since 2×13243990² = 350806542240200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13243991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3714 + ... + 6346.

It is an arithmetic number, because the mean of its divisors is an integer number (1493478).

Almost surely, 2^13243990 is an apocalyptic number.

13243990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13243990 is a deficient number, since it is larger than the sum of its proper divisors (10651658).

13243990 is a wasteful number, since it uses less digits than its factorization.

13243990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3143.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 13243990 is about 3639.2293140169. The cubic root of 13243990 is about 236.5953917044.

The spelling of 13243990 in words is "thirteen million, two hundred forty-three thousand, nine hundred ninety".