13806657 has 6 divisors (see below), whose sum is σ = 19942962. Its totient is φ = 9204432.

The previous prime is 13806643. The next prime is 13806671. The reversal of 13806657 is 75660831.

It is an interprime number because it is at equal distance from previous prime (13806643) and next prime (13806671).

It can be written as a sum of positive squares in only one way, i.e., 9790641 + 4016016 = 3129^2 + 2004^2 .

It is not a de Polignac number, because 13806657 - 2¹⁶ = 13741121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13806607) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 767028 + ... + 767045.

It is an arithmetic number, because the mean of its divisors is an integer number (3323827).

Almost surely, 2^13806657 is an apocalyptic number.

It is an amenable number.

13806657 is a deficient number, since it is larger than the sum of its proper divisors (6136305).

13806657 is a wasteful number, since it uses less digits than its factorization.

13806657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534079 (or 1534076 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 13806657 is about 3715.7310182520. The cubic root of 13806657 is about 239.8995934163.

The spelling of 13806657 in words is "thirteen million, eight hundred six thousand, six hundred fifty-seven".