13866813 has 12 divisors (see below), whose sum is σ = 20085468. Its totient is φ = 9218880.

The previous prime is 13866793. The next prime is 13866821. The reversal of 13866813 is 31866831.

It can be written as a sum of positive squares in 2 ways, for example, as 9018009 + 4848804 = 3003^2 + 2202^2 .

It is not a de Polignac number, because 13866813 - 2¹⁷ = 13735741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13866863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1633 + ... + 5513.

It is an arithmetic number, because the mean of its divisors is an integer number (1673789).

Almost surely, 2^13866813 is an apocalyptic number.

It is an amenable number.

13866813 is a deficient number, since it is larger than the sum of its proper divisors (6218655).

13866813 is a wasteful number, since it uses less digits than its factorization.

13866813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4284 (or 4281 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 13866813 is about 3723.8169933551. The cubic root of 13866813 is about 240.2475050841.

The spelling of 13866813 in words is "thirteen million, eight hundred sixty-six thousand, eight hundred thirteen".