13943999 has 4 divisors (see below), whose sum is σ = 14027664. Its totient is φ = 13860336.

The previous prime is 13943989. The next prime is 13944013. The reversal of 13943999 is 99934931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99934931 = 23 ⋅4344997.

It is a cyclic number.

It is not a de Polignac number, because 13943999 - 2¹⁶ = 13878463 is a prime.

It is a super-2 number, since 2×13943999² = 388870216224002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13943989) 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, 41582 + ... + 41915.

It is an arithmetic number, because the mean of its divisors is an integer number (3506916).

Almost surely, 2^13943999 is an apocalyptic number.

13943999 is a deficient number, since it is larger than the sum of its proper divisors (83665).

13943999 is an equidigital number, since it uses as much as digits as its factorization.

13943999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83664.

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

The square root of 13943999 is about 3734.1664397828. The cubic root of 13943999 is about 240.6924389374.

The spelling of 13943999 in words is "thirteen million, nine hundred forty-three thousand, nine hundred ninety-nine".