13799861 has 4 divisors (see below), whose sum is σ = 14120832. Its totient is φ = 13478892.

The previous prime is 13799831. The next prime is 13799887. The reversal of 13799861 is 16899731.

13799861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16899731 = 43 ⋅393017.

It is a cyclic number.

It is not a de Polignac number, because 13799861 - 2¹⁸ = 13537717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13799831) 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, 160421 + ... + 160506.

It is an arithmetic number, because the mean of its divisors is an integer number (3530208).

Almost surely, 2^13799861 is an apocalyptic number.

It is an amenable number.

13799861 is a deficient number, since it is larger than the sum of its proper divisors (320971).

13799861 is an equidigital number, since it uses as much as digits as its factorization.

13799861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320970.

The product of its digits is 81648, while the sum is 44.

The square root of 13799861 is about 3714.8164153831. The cubic root of 13799861 is about 239.8602253248.

The spelling of 13799861 in words is "thirteen million, seven hundred ninety-nine thousand, eight hundred sixty-one".