13858661 has 2 divisors, whose sum is σ = 13858662. Its totient is φ = 13858660.

The previous prime is 13858633. The next prime is 13858679. The reversal of 13858661 is 16685831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10176100 + 3682561 = 3190^2 + 1919^2 .

It is a cyclic number.

It is not a de Polignac number, because 13858661 - 2¹⁰ = 13857637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13858601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6929330 + 6929331.

It is an arithmetic number, because the mean of its divisors is an integer number (6929331).

Almost surely, 2^13858661 is an apocalyptic number.

It is an amenable number.

13858661 is a deficient number, since it is larger than the sum of its proper divisors (1).

13858661 is an equidigital number, since it uses as much as digits as its factorization.

13858661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 38.

The square root of 13858661 is about 3722.7222566289. The cubic root of 13858661 is about 240.2004170816.

The spelling of 13858661 in words is "thirteen million, eight hundred fifty-eight thousand, six hundred sixty-one".