18190979 has 2 divisors, whose sum is σ = 18190980. Its totient is φ = 18190978.

The previous prime is 18190973. The next prime is 18191023. The reversal of 18190979 is 97909181.

It is an a-pointer prime, because the next prime (18191023) can be obtained adding 18190979 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18190979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18190973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9095489 + 9095490.

It is an arithmetic number, because the mean of its divisors is an integer number (9095490).

Almost surely, 2^18190979 is an apocalyptic number.

18190979 is a deficient number, since it is larger than the sum of its proper divisors (1).

18190979 is an equidigital number, since it uses as much as digits as its factorization.

18190979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 18190979 is about 4265.0883929879. The cubic root of 18190979 is about 262.9977446351.

The spelling of 18190979 in words is "eighteen million, one hundred ninety thousand, nine hundred seventy-nine".