13899969 has 6 divisors (see below), whose sum is σ = 20077746. Its totient is φ = 9266640.

The previous prime is 13899967. The next prime is 13899973. The reversal of 13899969 is 96999831.

13899969 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 13068225 + 831744 = 3615^2 + 912^2 .

It is not a de Polignac number, because 13899969 - 2¹ = 13899967 is a prime.

It is a super-2 number, since 2×13899969² = 386418276401922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13899967) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 772212 + ... + 772229.

It is an arithmetic number, because the mean of its divisors is an integer number (3346291).

Almost surely, 2^13899969 is an apocalyptic number.

It is an amenable number.

13899969 is a deficient number, since it is larger than the sum of its proper divisors (6177777).

13899969 is a wasteful number, since it uses less digits than its factorization.

13899969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544447 (or 1544444 counting only the distinct ones).

The product of its digits is 944784, while the sum is 54.

The square root of 13899969 is about 3728.2662190353. The cubic root of 13899969 is about 240.4388325360.

The spelling of 13899969 in words is "thirteen million, eight hundred ninety-nine thousand, nine hundred sixty-nine".