13857661 has 8 divisors (see below), whose sum is σ = 14518080. Its totient is φ = 13202112.

The previous prime is 13857637. The next prime is 13857667. The reversal of 13857661 is 16675831.

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

It is a cyclic number.

It is not a de Polignac number, because 13857661 - 2⁵ = 13857629 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13857661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13857667) 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, 5445 + ... + 7573.

It is an arithmetic number, because the mean of its divisors is an integer number (1814760).

Almost surely, 2^13857661 is an apocalyptic number.

It is an amenable number.

13857661 is a deficient number, since it is larger than the sum of its proper divisors (660419).

13857661 is a wasteful number, since it uses less digits than its factorization.

13857661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2435.

The product of its digits is 30240, while the sum is 37.

The square root of 13857661 is about 3722.5879438906. The cubic root of 13857661 is about 240.1946395587.

The spelling of 13857661 in words is "thirteen million, eight hundred fifty-seven thousand, six hundred sixty-one".