13999237 has 4 divisors (see below), whose sum is σ = 15999136. Its totient is φ = 11999340.

The previous prime is 13999213. The next prime is 13999253. The reversal of 13999237 is 73299931.

13999237 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 73299931 = 47 ⋅1559573.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13999237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13999193 and 13999202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13999267) 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, 999939 + ... + 999952.

It is an arithmetic number, because the mean of its divisors is an integer number (3999784).

Almost surely, 2^13999237 is an apocalyptic number.

It is an amenable number.

13999237 is a deficient number, since it is larger than the sum of its proper divisors (1999899).

13999237 is an equidigital number, since it uses as much as digits as its factorization.

13999237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999898.

The product of its digits is 91854, while the sum is 43.

The square root of 13999237 is about 3741.5554252209. Note that the first 3 decimals coincide. The cubic root of 13999237 is about 241.0098479129.

The spelling of 13999237 in words is "thirteen million, nine hundred ninety-nine thousand, two hundred thirty-seven".