13999031 has 4 divisors (see below), whose sum is σ = 14012232. Its totient is φ = 13985832.

The previous prime is 13999009. The next prime is 13999057. The reversal of 13999031 is 13099931.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 13999031 - 2¹⁸ = 13736887 is a prime.

It is a super-2 number, since 2×13999031² = 391945737877922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13998982 and 13999000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13999831) 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, 4856 + ... + 7181.

It is an arithmetic number, because the mean of its divisors is an integer number (3503058).

Almost surely, 2^13999031 is an apocalyptic number.

13999031 is a deficient number, since it is larger than the sum of its proper divisors (13201).

13999031 is a wasteful number, since it uses less digits than its factorization.

13999031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13200.

The product of its (nonzero) digits is 6561, while the sum is 35.

The square root of 13999031 is about 3741.5278964616. The cubic root of 13999031 is about 241.0086657467.

The spelling of 13999031 in words is "thirteen million, nine hundred ninety-nine thousand, thirty-one".