13929777 has 12 divisors (see below), whose sum is σ = 20451444. Its totient is φ = 9133920.

The previous prime is 13929767. The next prime is 13929779. The reversal of 13929777 is 77792931.

It can be written as a sum of positive squares in 2 ways, for example, as 269361 + 13660416 = 519^2 + 3696^2 .

It is not a de Polignac number, because 13929777 - 2⁴ = 13929761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13929779) 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, 12138 + ... + 13235.

It is an arithmetic number, because the mean of its divisors is an integer number (1704287).

Almost surely, 2^13929777 is an apocalyptic number.

It is an amenable number.

13929777 is a deficient number, since it is larger than the sum of its proper divisors (6521667).

13929777 is a wasteful number, since it uses less digits than its factorization.

13929777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25440 (or 25437 counting only the distinct ones).

The product of its digits is 166698, while the sum is 45.

The square root of 13929777 is about 3732.2616467767. The cubic root of 13929777 is about 240.6105807293.

It can be divided in two parts, 13929 and 777, that added together give a triangular number (14706 = T₁₇₁).

The spelling of 13929777 in words is "thirteen million, nine hundred twenty-nine thousand, seven hundred seventy-seven".