18423261 has 16 divisors (see below), whose sum is σ = 27625920. Its totient is φ = 12132720.

The previous prime is 18423259. The next prime is 18423311. The reversal of 18423261 is 16232481.

It is not a de Polignac number, because 18423261 - 2¹ = 18423259 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18423211) 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, 1870 + ... + 6351.

It is an arithmetic number, because the mean of its divisors is an integer number (1726620).

Almost surely, 2^18423261 is an apocalyptic number.

It is an amenable number.

18423261 is a deficient number, since it is larger than the sum of its proper divisors (9202659).

18423261 is an equidigital number, since it uses as much as digits as its factorization.

18423261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8313 (or 8307 counting only the distinct ones).

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

The square root of 18423261 is about 4292.2326358202. The cubic root of 18423261 is about 264.1124262892.

The spelling of 18423261 in words is "eighteen million, four hundred twenty-three thousand, two hundred sixty-one".