13890939 has 4 divisors (see below), whose sum is σ = 18521256. Its totient is φ = 9260624.

The previous prime is 13890931. The next prime is 13890941. The reversal of 13890939 is 93909831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93909831 = 3 ⋅31303277.

It is a cyclic number.

It is not a de Polignac number, because 13890939 - 2³ = 13890931 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13890939.

It is not an unprimeable number, because it can be changed into a prime (13890931) 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, 2315154 + ... + 2315159.

It is an arithmetic number, because the mean of its divisors is an integer number (4630314).

Almost surely, 2^13890939 is an apocalyptic number.

13890939 is a deficient number, since it is larger than the sum of its proper divisors (4630317).

13890939 is an equidigital number, since it uses as much as digits as its factorization.

13890939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4630316.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 13890939 is about 3727.0550036188. The cubic root of 13890939 is about 240.3867548902.

The spelling of 13890939 in words is "thirteen million, eight hundred ninety thousand, nine hundred thirty-nine".