18872123 has 2 divisors, whose sum is σ = 18872124. Its totient is φ = 18872122.

The previous prime is 18872093. The next prime is 18872143. The reversal of 18872123 is 32127881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18872123 - 2⁶ = 18872059 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18872123.

It is not a weakly prime, because it can be changed into another prime (18872143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9436061 + 9436062.

It is an arithmetic number, because the mean of its divisors is an integer number (9436062).

Almost surely, 2^18872123 is an apocalyptic number.

18872123 is a deficient number, since it is larger than the sum of its proper divisors (1).

18872123 is an equidigital number, since it uses as much as digits as its factorization.

18872123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 32.

The square root of 18872123 is about 4344.2056811344. The cubic root of 18872123 is about 266.2401725894.

The spelling of 18872123 in words is "eighteen million, eight hundred seventy-two thousand, one hundred twenty-three".