13888661 has 4 divisors (see below), whose sum is σ = 13900800. Its totient is φ = 13876524.

The previous prime is 13888607. The next prime is 13888669. The reversal of 13888661 is 16688831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16688831 = 349 ⋅47819.

It is a cyclic number.

It is not a de Polignac number, because 13888661 - 2¹⁸ = 13626517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13888669) 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, 4151 + ... + 6708.

It is an arithmetic number, because the mean of its divisors is an integer number (3475200).

Almost surely, 2^13888661 is an apocalyptic number.

It is an amenable number.

13888661 is a deficient number, since it is larger than the sum of its proper divisors (12139).

13888661 is a wasteful number, since it uses less digits than its factorization.

13888661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12138.

The product of its digits is 55296, while the sum is 41.

The square root of 13888661 is about 3726.7493878714. The cubic root of 13888661 is about 240.3736136868.

The spelling of 13888661 in words is "thirteen million, eight hundred eighty-eight thousand, six hundred sixty-one".