18706873 has 2 divisors, whose sum is σ = 18706874. Its totient is φ = 18706872.

The previous prime is 18706861. The next prime is 18706879. The reversal of 18706873 is 37860781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13630864 + 5076009 = 3692^2 + 2253^2 .

It is a cyclic number.

It is not a de Polignac number, because 18706873 - 2⁵ = 18706841 is a prime.

It is not a weakly prime, because it can be changed into another prime (18706879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9353436 + 9353437.

It is an arithmetic number, because the mean of its divisors is an integer number (9353437).

Almost surely, 2^18706873 is an apocalyptic number.

It is an amenable number.

18706873 is a deficient number, since it is larger than the sum of its proper divisors (1).

18706873 is an equidigital number, since it uses as much as digits as its factorization.

18706873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 18706873 is about 4325.1442750503. The cubic root of 18706873 is about 265.4608002579.

The spelling of 18706873 in words is "eighteen million, seven hundred six thousand, eight hundred seventy-three".