13969999 has 4 divisors (see below), whose sum is σ = 14040400. Its totient is φ = 13899600.

The previous prime is 13969973. The next prime is 13970009. The reversal of 13969999 is 99996931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13969999 is a prime.

It is a Duffinian number.

13969999 is a modest number, since divided by 9999 gives 1396 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13969099) 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, 34902 + ... + 35299.

It is an arithmetic number, because the mean of its divisors is an integer number (3510100).

Almost surely, 2^13969999 is an apocalyptic number.

13969999 is a deficient number, since it is larger than the sum of its proper divisors (70401).

13969999 is an equidigital number, since it uses as much as digits as its factorization.

13969999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70400.

The product of its digits is 1062882, while the sum is 55.

The square root of 13969999 is about 3737.6461844321. The cubic root of 13969999 is about 240.8419445390.

The spelling of 13969999 in words is "thirteen million, nine hundred sixty-nine thousand, nine hundred ninety-nine".