13999967 has 4 divisors (see below), whose sum is σ = 14157360. Its totient is φ = 13842576.

The previous prime is 13999961. The next prime is 13999969. The reversal of 13999967 is 76999931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76999931 = 191 ⋅403141.

It is a cyclic number.

It is not a de Polignac number, because 13999967 - 2¹² = 13995871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13999961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78563 + ... + 78740.

It is an arithmetic number, because the mean of its divisors is an integer number (3539340).

Almost surely, 2^13999967 is an apocalyptic number.

13999967 is a deficient number, since it is larger than the sum of its proper divisors (157393).

13999967 is an equidigital number, since it uses as much as digits as its factorization.

13999967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157392.

The product of its digits is 826686, while the sum is 53.

The square root of 13999967 is about 3741.6529769609. The cubic root of 13999967 is about 241.0140370491.

The spelling of 13999967 in words is "thirteen million, nine hundred ninety-nine thousand, nine hundred sixty-seven".