13987939 has 4 divisors (see below), whose sum is σ = 15986224. Its totient is φ = 11989656.

The previous prime is 13987921. The next prime is 13987949. The reversal of 13987939 is 93978931.

13987939 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 13987939 - 2²¹ = 11890787 is a prime.

It is a Duffinian number.

13987939 is strictly pandigital in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 13987892 and 13987901.

It is not an unprimeable number, because it can be changed into a prime (13987949) 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, 999132 + ... + 999145.

It is an arithmetic number, because the mean of its divisors is an integer number (3996556).

Almost surely, 2^13987939 is an apocalyptic number.

13987939 is a deficient number, since it is larger than the sum of its proper divisors (1998285).

13987939 is an equidigital number, since it uses as much as digits as its factorization.

13987939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1998284.

The product of its digits is 367416, while the sum is 49.

The square root of 13987939 is about 3740.0453205810. The cubic root of 13987939 is about 240.9449952808.

The spelling of 13987939 in words is "thirteen million, nine hundred eighty-seven thousand, nine hundred thirty-nine".