13889779 has 4 divisors (see below), whose sum is σ = 14620840. Its totient is φ = 13158720.

The previous prime is 13889749. The next prime is 13889789. The reversal of 13889779 is 97798831.

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

It is a cyclic number.

It is not a de Polignac number, because 13889779 - 2⁵ = 13889747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13889749) 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, 365502 + ... + 365539.

It is an arithmetic number, because the mean of its divisors is an integer number (3655210).

Almost surely, 2^13889779 is an apocalyptic number.

13889779 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

13889779 is a deficient number, since it is larger than the sum of its proper divisors (731061).

13889779 is an equidigital number, since it uses as much as digits as its factorization.

13889779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731060.

The product of its digits is 762048, while the sum is 52.

The square root of 13889779 is about 3726.8993815235. The cubic root of 13889779 is about 240.3800633243.

The spelling of 13889779 in words is "thirteen million, eight hundred eighty-nine thousand, seven hundred seventy-nine".