18870423 has 16 divisors (see below), whose sum is σ = 29559936. Its totient is φ = 10556640.

The previous prime is 18870389. The next prime is 18870469. The reversal of 18870423 is 32407881.

It is not a de Polignac number, because 18870423 - 2¹⁷ = 18739351 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18870023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21565 + ... + 22422.

It is an arithmetic number, because the mean of its divisors is an integer number (1847496).

Almost surely, 2^18870423 is an apocalyptic number.

18870423 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18870423 is a deficient number, since it is larger than the sum of its proper divisors (10689513).

18870423 is a wasteful number, since it uses less digits than its factorization.

18870423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44014.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 18870423 is about 4344.0100138006. The cubic root of 18870423 is about 266.2321780484.

It can be divided in two parts, 18870 and 423, that multiplied together give a triangular number (7982010 = T₃₉₉₅).

The spelling of 18870423 in words is "eighteen million, eight hundred seventy thousand, four hundred twenty-three".