13661838 has 32 divisors (see below), whose sum is σ = 30481920. Its totient is φ = 4535640.

The previous prime is 13661833. The next prime is 13661849. The reversal of 13661838 is 83816631.

13661838 is a `hidden beast` number, since 1 + 3 + 6 + 618 + 38 = 666.

13661838 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13661833) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22981 + ... + 23567.

It is an arithmetic number, because the mean of its divisors is an integer number (952560).

Almost surely, 2^13661838 is an apocalyptic number.

13661838 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13661838 is an abundant number, since it is smaller than the sum of its proper divisors (16820082).

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

13661838 is a wasteful number, since it uses less digits than its factorization.

13661838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029 (or 1023 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 13661838 is about 3696.1923651239. The cubic root of 13661838 is about 239.0578689607.

The spelling of 13661838 in words is "thirteen million, six hundred sixty-one thousand, eight hundred thirty-eight".