13860521 has 6 divisors (see below), whose sum is σ = 14355822. Its totient is φ = 13381760.

The previous prime is 13860493. The next prime is 13860541. The reversal of 13860521 is 12506831.

It can be written as a sum of positive squares in 3 ways, for example, as 1784896 + 12075625 = 1336^2 + 3475^2 .

It is a de Polignac number, because none of the positive numbers 2^k-13860521 is a prime.

It is a super-2 number, since 2×13860521² = 384228084782882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13860541) 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, 7400 + ... + 9081.

It is an arithmetic number, because the mean of its divisors is an integer number (2392637).

Almost surely, 2^13860521 is an apocalyptic number.

It is an amenable number.

13860521 is a deficient number, since it is larger than the sum of its proper divisors (495301).

13860521 is an equidigital number, since it uses as much as digits as its factorization.

13860521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16539 (or 16510 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 13860521 is about 3722.9720654337. The cubic root of 13860521 is about 240.2111625351.

The spelling of 13860521 in words is "thirteen million, eight hundred sixty thousand, five hundred twenty-one".