18734879 has 2 divisors, whose sum is σ = 18734880. Its totient is φ = 18734878.

The previous prime is 18734861. The next prime is 18734927. The reversal of 18734879 is 97843781.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18734879 - 2²⁴ = 1957663 is a prime.

It is a super-2 number, since 2×18734879² = 701991382289282, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18734809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9367439 + 9367440.

It is an arithmetic number, because the mean of its divisors is an integer number (9367440).

Almost surely, 2^18734879 is an apocalyptic number.

18734879 is a deficient number, since it is larger than the sum of its proper divisors (1).

18734879 is an equidigital number, since it uses as much as digits as its factorization.

18734879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 47.

The square root of 18734879 is about 4328.3806440746. The cubic root of 18734879 is about 265.5932077105.

The spelling of 18734879 in words is "eighteen million, seven hundred thirty-four thousand, eight hundred seventy-nine".