13660638 has 16 divisors (see below), whose sum is σ = 27651456. Its totient is φ = 4498520.

The previous prime is 13660637. The next prime is 13660649. The reversal of 13660638 is 83606631.

It is a super-2 number, since 2×13660638² = 373226061134088, 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 junction number, because it is equal to n+sod(n) for n = 13660599 and 13660608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13660637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13218 + ... + 14213.

It is an arithmetic number, because the mean of its divisors is an integer number (1728216).

Almost surely, 2^13660638 is an apocalyptic number.

13660638 is an abundant number, since it is smaller than the sum of its proper divisors (13990818).

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

13660638 is a wasteful number, since it uses less digits than its factorization.

13660638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27519.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 13660638 is about 3696.0300323455. The cubic root of 13660638 is about 239.0508694671.

The spelling of 13660638 in words is "thirteen million, six hundred sixty thousand, six hundred thirty-eight".