13977861 has 4 divisors (see below), whose sum is σ = 18637152. Its totient is φ = 9318572.

The previous prime is 13977857. The next prime is 13977871. The reversal of 13977861 is 16877931.

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.

It is a cyclic number.

It is not a de Polignac number, because 13977861 - 2² = 13977857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13977811) 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, 2329641 + ... + 2329646.

It is an arithmetic number, because the mean of its divisors is an integer number (4659288).

Almost surely, 2^13977861 is an apocalyptic number.

It is an amenable number.

13977861 is a deficient number, since it is larger than the sum of its proper divisors (4659291).

13977861 is an equidigital number, since it uses as much as digits as its factorization.

13977861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4659290.

The product of its digits is 63504, while the sum is 42.

The square root of 13977861 is about 3738.6977679401. The cubic root of 13977861 is about 240.8871162023.

The spelling of 13977861 in words is "thirteen million, nine hundred seventy-seven thousand, eight hundred sixty-one".