18984379 has 2 divisors, whose sum is σ = 18984380. Its totient is φ = 18984378.

The previous prime is 18984347. The next prime is 18984391. The reversal of 18984379 is 97348981.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18984379 - 2⁵ = 18984347 is a prime.

It is not a weakly prime, because it can be changed into another prime (18984479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9492189 + 9492190.

It is an arithmetic number, because the mean of its divisors is an integer number (9492190).

Almost surely, 2^18984379 is an apocalyptic number.

18984379 is a deficient number, since it is larger than the sum of its proper divisors (1).

18984379 is an equidigital number, since it uses as much as digits as its factorization.

18984379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 49.

The square root of 18984379 is about 4357.1067235036. The cubic root of 18984379 is about 266.7670165727.

The spelling of 18984379 in words is "eighteen million, nine hundred eighty-four thousand, three hundred seventy-nine".