18172045 has 8 divisors (see below), whose sum is σ = 22510080. Its totient is φ = 14068560.

The previous prime is 18172019. The next prime is 18172073. The reversal of 18172045 is 54027181.

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

It is not a de Polignac number, because 18172045 - 2⁹ = 18171533 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58465 + ... + 58774.

It is an arithmetic number, because the mean of its divisors is an integer number (2813760).

Almost surely, 2^18172045 is an apocalyptic number.

It is an amenable number.

18172045 is a deficient number, since it is larger than the sum of its proper divisors (4338035).

18172045 is a wasteful number, since it uses less digits than its factorization.

18172045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117275.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 18172045 is about 4262.8681659183. The cubic root of 18172045 is about 262.9064662792.

The spelling of 18172045 in words is "eighteen million, one hundred seventy-two thousand, forty-five".