18914239 has 2 divisors, whose sum is σ = 18914240. Its totient is φ = 18914238.

The previous prime is 18914213. The next prime is 18914249. The reversal of 18914239 is 93241981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18914239 - 2⁷ = 18914111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18914198 and 18914207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18914249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9457119 + 9457120.

It is an arithmetic number, because the mean of its divisors is an integer number (9457120).

Almost surely, 2^18914239 is an apocalyptic number.

18914239 is a deficient number, since it is larger than the sum of its proper divisors (1).

18914239 is an equidigital number, since it uses as much as digits as its factorization.

18914239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 18914239 is about 4349.0503561122. The cubic root of 18914239 is about 266.4380771970.

The spelling of 18914239 in words is "eighteen million, nine hundred fourteen thousand, two hundred thirty-nine".