13866961 has 4 divisors (see below), whose sum is σ = 13877172. Its totient is φ = 13856752.

The previous prime is 13866929. The next prime is 13866967. The reversal of 13866961 is 16966831.

13866961 = T₃₀₃₉ + T₃₀₄₀ + T₃₀₄₁.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 9265936 + 4601025 = 3044^2 + 2145^2 .

It is a cyclic number.

It is not a de Polignac number, because 13866961 - 2⁵ = 13866929 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13866967) 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, 2686 + ... + 5911.

It is an arithmetic number, because the mean of its divisors is an integer number (3469293).

Almost surely, 2^13866961 is an apocalyptic number.

13866961 is the 3041-st centered triangular number.

It is an amenable number.

13866961 is a deficient number, since it is larger than the sum of its proper divisors (10211).

13866961 is an equidigital number, since it uses as much as digits as its factorization.

13866961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10210.

The product of its digits is 46656, while the sum is 40.

The square root of 13866961 is about 3723.8368653849. The cubic root of 13866961 is about 240.2483597987.

The spelling of 13866961 in words is "thirteen million, eight hundred sixty-six thousand, nine hundred sixty-one".