18988367 has 2 divisors, whose sum is σ = 18988368. Its totient is φ = 18988366.

The previous prime is 18988357. The next prime is 18988393. The reversal of 18988367 is 76388981.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18988367 - 2⁴ = 18988351 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 (18988357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9494183 + 9494184.

It is an arithmetic number, because the mean of its divisors is an integer number (9494184).

Almost surely, 2^18988367 is an apocalyptic number.

18988367 is a deficient number, since it is larger than the sum of its proper divisors (1).

18988367 is an equidigital number, since it uses as much as digits as its factorization.

18988367 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 50.

The square root of 18988367 is about 4357.5643426116. The cubic root of 18988367 is about 266.7856949534.

The spelling of 18988367 in words is "eighteen million, nine hundred eighty-eight thousand, three hundred sixty-seven".