13779999 has 6 divisors (see below), whose sum is σ = 19904456. Its totient is φ = 9186660.

The previous prime is 13779973. The next prime is 13780003. The reversal of 13779999 is 99997731.

It is not a de Polignac number, because 13779999 - 2¹⁵ = 13747231 is a prime.

It is a Duffinian number.

13779999 is a modest number, since divided by 9999 gives 1377 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13779949) 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 5 ways as a sum of consecutive naturals, for example, 765547 + ... + 765564.

Almost surely, 2^13779999 is an apocalyptic number.

13779999 is a deficient number, since it is larger than the sum of its proper divisors (6124457).

13779999 is a wasteful number, since it uses less digits than its factorization.

13779999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1531117 (or 1531114 counting only the distinct ones).

The product of its digits is 964467, while the sum is 54.

The square root of 13779999 is about 3712.1421039610. The cubic root of 13779999 is about 239.7450939413.

The spelling of 13779999 in words is "thirteen million, seven hundred seventy-nine thousand, nine hundred ninety-nine".