13779887 has 4 divisors (see below), whose sum is σ = 15032616. Its totient is φ = 12527160.

The previous prime is 13779869. The next prime is 13779907. The reversal of 13779887 is 78897731.

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 13779887 - 2⁸ = 13779631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13779817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 626348 + ... + 626369.

It is an arithmetic number, because the mean of its divisors is an integer number (3758154).

Almost surely, 2^13779887 is an apocalyptic number.

13779887 is a deficient number, since it is larger than the sum of its proper divisors (1252729).

13779887 is a wasteful number, since it uses less digits than its factorization.

13779887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252728.

The product of its digits is 592704, while the sum is 50.

The square root of 13779887 is about 3712.1270183010. The cubic root of 13779887 is about 239.7444444124.

The spelling of 13779887 in words is "thirteen million, seven hundred seventy-nine thousand, eight hundred eighty-seven".