13391838 has 16 divisors (see below), whose sum is σ = 29759760. Its totient is φ = 4463928.

The previous prime is 13391831. The next prime is 13391839. The reversal of 13391838 is 83819331.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13391831) 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, 123945 + ... + 124052.

It is an arithmetic number, because the mean of its divisors is an integer number (1859985).

Almost surely, 2^13391838 is an apocalyptic number.

13391838 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13391838 is an abundant number, since it is smaller than the sum of its proper divisors (16367922).

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

13391838 is a wasteful number, since it uses less digits than its factorization.

13391838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248008 (or 248002 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 13391838 is about 3659.4860294856. The cubic root of 13391838 is about 237.4725390225.

It can be divided in two parts, 133918 and 38, that added together give a square (133956 = 366²).

The spelling of 13391838 in words is "thirteen million, three hundred ninety-one thousand, eight hundred thirty-eight".