13899665 has 16 divisors (see below), whose sum is σ = 18050256. Its totient is φ = 10214400.

The previous prime is 13899661. The next prime is 13899673. The reversal of 13899665 is 56699831.

It can be written as a sum of positive squares in 8 ways, for example, as 3717184 + 10182481 = 1928^2 + 3191^2 .

It is not a de Polignac number, because 13899665 - 2² = 13899661 is a prime.

It is a super-2 number, since 2×13899665² = 386401374224450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13899661) 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 15 ways as a sum of consecutive naturals, for example, 17885 + ... + 18645.

It is an arithmetic number, because the mean of its divisors is an integer number (1128141).

Almost surely, 2^13899665 is an apocalyptic number.

It is an amenable number.

13899665 is a deficient number, since it is larger than the sum of its proper divisors (4150591).

13899665 is a wasteful number, since it uses less digits than its factorization.

13899665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060.

The product of its digits is 349920, while the sum is 47.

The square root of 13899665 is about 3728.2254491916. The cubic root of 13899665 is about 240.4370796798.

The spelling of 13899665 in words is "thirteen million, eight hundred ninety-nine thousand, six hundred sixty-five".