13439999 has 4 divisors (see below), whose sum is σ = 13640664. Its totient is φ = 13239336.

The previous prime is 13439939. The next prime is 13440001. The reversal of 13439999 is 99993431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99993431 = 1327 ⋅75353.

It is a cyclic number.

It is not a de Polignac number, because 13439999 - 2⁸ = 13439743 is a prime.

13439999 is a modest number, since divided by 9999 gives 1343 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13439929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100232 + ... + 100365.

It is an arithmetic number, because the mean of its divisors is an integer number (3410166).

Almost surely, 2^13439999 is an apocalyptic number.

13439999 is a deficient number, since it is larger than the sum of its proper divisors (200665).

13439999 is an equidigital number, since it uses as much as digits as its factorization.

13439999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200664.

The product of its digits is 236196, while the sum is 47.

The square root of 13439999 is about 3666.0604195785. The cubic root of 13439999 is about 237.7568722138.

The spelling of 13439999 in words is "thirteen million, four hundred thirty-nine thousand, nine hundred ninety-nine".