18261423 has 8 divisors (see below), whose sum is σ = 27054000. Its totient is φ = 12174264.

The previous prime is 18261409. The next prime is 18261431. The reversal of 18261423 is 32416281.

18261423 is a `hidden beast` number, since 182 + 61 + 423 = 666.

It is not a de Polignac number, because 18261423 - 2⁴ = 18261407 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 676349 = 18261423 / (1 + 8 + 2 + 6 + 1 + 4 + 2 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18261433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338148 + ... + 338201.

It is an arithmetic number, because the mean of its divisors is an integer number (3381750).

Almost surely, 2^18261423 is an apocalyptic number.

18261423 is a deficient number, since it is larger than the sum of its proper divisors (8792577).

18261423 is an equidigital number, since it uses as much as digits as its factorization.

18261423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676358 (or 676352 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 18261423 is about 4273.3386245417. The cubic root of 18261423 is about 263.3367908891.

It can be divided in two parts, 1826 and 1423, that added together give a square (3249 = 57²).

The spelling of 18261423 in words is "eighteen million, two hundred sixty-one thousand, four hundred twenty-three".