13771979 has 12 divisors (see below), whose sum is σ = 15701400. Its totient is φ = 12040704.

The previous prime is 13771973. The next prime is 13771999. The reversal of 13771979 is 97917731.

It is a happy number.

It is not a de Polignac number, because 13771979 - 2¹⁶ = 13706443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13771973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1067 + ... + 5355.

It is an arithmetic number, because the mean of its divisors is an integer number (1308450).

Almost surely, 2^13771979 is an apocalyptic number.

13771979 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

13771979 is a deficient number, since it is larger than the sum of its proper divisors (1929421).

13771979 is a wasteful number, since it uses less digits than its factorization.

13771979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4334 (or 4321 counting only the distinct ones).

The product of its digits is 83349, while the sum is 44.

The square root of 13771979 is about 3711.0617079213. The cubic root of 13771979 is about 239.6985741316.

The spelling of 13771979 in words is "thirteen million, seven hundred seventy-one thousand, nine hundred seventy-nine".