18158045 has 4 divisors (see below), whose sum is σ = 21789660. Its totient is φ = 14526432.

The previous prime is 18158029. The next prime is 18158099. The reversal of 18158045 is 54085181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13344409 + 4813636 = 3653^2 + 2194^2 .

It is a cyclic number.

It is not a de Polignac number, because 18158045 - 2⁴ = 18158029 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1815800 + ... + 1815809.

It is an arithmetic number, because the mean of its divisors is an integer number (5447415).

Almost surely, 2^18158045 is an apocalyptic number.

It is an amenable number.

18158045 is a deficient number, since it is larger than the sum of its proper divisors (3631615).

18158045 is an equidigital number, since it uses as much as digits as its factorization.

18158045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3631614.

The product of its (nonzero) digits is 6400, while the sum is 32.

The square root of 18158045 is about 4261.2257626181. The cubic root of 18158045 is about 262.8389333158.

The spelling of 18158045 in words is "eighteen million, one hundred fifty-eight thousand, forty-five".