13660538 has 8 divisors (see below), whose sum is σ = 20877588. Its totient is φ = 6701344.

The previous prime is 13660531. The next prime is 13660547. The reversal of 13660538 is 83506631.

13660538 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 12837889 + 822649 = 3583^2 + 907^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×13660538² = 373220596898888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13660531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64331 + ... + 64542.

Almost surely, 2^13660538 is an apocalyptic number.

13660538 is a deficient number, since it is larger than the sum of its proper divisors (7217050).

13660538 is a wasteful number, since it uses less digits than its factorization.

13660538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128928.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 13660538 is about 3696.0165042922. The cubic root of 13660538 is about 239.0502861574.

The spelling of 13660538 in words is "thirteen million, six hundred sixty thousand, five hundred thirty-eight".