18739247 has 2 divisors, whose sum is σ = 18739248. Its totient is φ = 18739246.

The previous prime is 18739241. The next prime is 18739277. The reversal of 18739247 is 74293781.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18739247 - 2⁶ = 18739183 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18739241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9369623 + 9369624.

It is an arithmetic number, because the mean of its divisors is an integer number (9369624).

Almost surely, 2^18739247 is an apocalyptic number.

18739247 is a deficient number, since it is larger than the sum of its proper divisors (1).

18739247 is an equidigital number, since it uses as much as digits as its factorization.

18739247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 41.

The square root of 18739247 is about 4328.8851913628. The cubic root of 18739247 is about 265.6138469504.

The spelling of 18739247 in words is "eighteen million, seven hundred thirty-nine thousand, two hundred forty-seven".