18047145 has 16 divisors (see below), whose sum is σ = 29158272. Its totient is φ = 9530880.

The previous prime is 18047089. The next prime is 18047173. The reversal of 18047145 is 54174081.

It is not a de Polignac number, because 18047145 - 2²¹ = 15949993 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4296 + ... + 7385.

It is an arithmetic number, because the mean of its divisors is an integer number (1822392).

Almost surely, 2^18047145 is an apocalyptic number.

18047145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18047145 is a deficient number, since it is larger than the sum of its proper divisors (11111127).

18047145 is a wasteful number, since it uses less digits than its factorization.

18047145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11792.

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 18047145 is about 4248.1931453266. The cubic root of 18047145 is about 262.3027452347.

The spelling of 18047145 in words is "eighteen million, forty-seven thousand, one hundred forty-five".