13860509 has 8 divisors (see below), whose sum is σ = 14958552. Its totient is φ = 12767040.

The previous prime is 13860493. The next prime is 13860541. The reversal of 13860509 is 90506831.

It can be written as a sum of positive squares in 4 ways, for example, as 2280100 + 11580409 = 1510^2 + 3403^2 .

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

It is not a de Polignac number, because 13860509 - 2⁴ = 13860493 is a prime.

It is a super-2 number, since 2×13860509² = 384227419478162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13860569) 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, 7787 + ... + 9399.

It is an arithmetic number, because the mean of its divisors is an integer number (1869819).

Almost surely, 2^13860509 is an apocalyptic number.

It is an amenable number.

13860509 is a deficient number, since it is larger than the sum of its proper divisors (1098043).

13860509 is a wasteful number, since it uses less digits than its factorization.

13860509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2287.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 13860509 is about 3722.9704538178. The cubic root of 13860509 is about 240.2110932126.

The spelling of 13860509 in words is "thirteen million, eight hundred sixty thousand, five hundred nine".