18839147 has 2 divisors, whose sum is σ = 18839148. Its totient is φ = 18839146.

The previous prime is 18839141. The next prime is 18839153. The reversal of 18839147 is 74193881.

It is a balanced prime because it is at equal distance from previous prime (18839141) and next prime (18839153).

It is a cyclic number.

It is not a de Polignac number, because 18839147 - 2¹² = 18835051 is a prime.

It is not a weakly prime, because it can be changed into another prime (18839141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9419573 + 9419574.

It is an arithmetic number, because the mean of its divisors is an integer number (9419574).

Almost surely, 2^18839147 is an apocalyptic number.

18839147 is a deficient number, since it is larger than the sum of its proper divisors (1).

18839147 is an equidigital number, since it uses as much as digits as its factorization.

18839147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 41.

The square root of 18839147 is about 4340.4086213167. The cubic root of 18839147 is about 266.0850115527.

The spelling of 18839147 in words is "eighteen million, eight hundred thirty-nine thousand, one hundred forty-seven".