18423249 has 8 divisors (see below), whose sum is σ = 26453952. Its totient is φ = 11337360.

The previous prime is 18423241. The next prime is 18423259. The reversal of 18423249 is 94232481.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18423249 - 2³ = 18423241 is a prime.

It is a super-2 number, since 2×18423249² = 678832207432002, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (18423241) 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, 236157 + ... + 236234.

It is an arithmetic number, because the mean of its divisors is an integer number (3306744).

Almost surely, 2^18423249 is an apocalyptic number.

It is an amenable number.

18423249 is a deficient number, since it is larger than the sum of its proper divisors (8030703).

18423249 is a wasteful number, since it uses less digits than its factorization.

18423249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472407.

The product of its digits is 13824, while the sum is 33.

The square root of 18423249 is about 4292.2312379461. The cubic root of 18423249 is about 264.1123689460.

The spelling of 18423249 in words is "eighteen million, four hundred twenty-three thousand, two hundred forty-nine".