18072945 has 48 divisors (see below), whose sum is σ = 35380800. Its totient is φ = 8453760.

The previous prime is 18072913. The next prime is 18072949. The reversal of 18072945 is 54927081.

It is not a de Polignac number, because 18072945 - 2⁵ = 18072913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18072949) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13726 + ... + 14984.

It is an arithmetic number, because the mean of its divisors is an integer number (737100).

Almost surely, 2^18072945 is an apocalyptic number.

18072945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18072945 is a deficient number, since it is larger than the sum of its proper divisors (17307855).

18072945 is a wasteful number, since it uses less digits than its factorization.

18072945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1310 (or 1307 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 18072945 is about 4251.2286459328. The cubic root of 18072945 is about 262.4276807580.

The spelling of 18072945 in words is "eighteen million, seventy-two thousand, nine hundred forty-five".