18640079 has 2 divisors, whose sum is σ = 18640080. Its totient is φ = 18640078.

The previous prime is 18640073. The next prime is 18640087. The reversal of 18640079 is 97004681.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18640079 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 (18640073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9320039 + 9320040.

It is an arithmetic number, because the mean of its divisors is an integer number (9320040).

Almost surely, 2^18640079 is an apocalyptic number.

18640079 is a deficient number, since it is larger than the sum of its proper divisors (1).

18640079 is an equidigital number, since it uses as much as digits as its factorization.

18640079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 18640079 is about 4317.4157779857. The cubic root of 18640079 is about 265.1444756273.

The spelling of 18640079 in words is "eighteen million, six hundred forty thousand, seventy-nine".