18912945 has 32 divisors (see below), whose sum is σ = 31656960. Its totient is φ = 9630720.

The previous prime is 18912937. The next prime is 18912979. The reversal of 18912945 is 54921981.

It is not a de Polignac number, because 18912945 - 2³ = 18912937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41157 + ... + 41613.

It is an arithmetic number, because the mean of its divisors is an integer number (989280).

Almost surely, 2^18912945 is an apocalyptic number.

18912945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18912945 is a deficient number, since it is larger than the sum of its proper divisors (12744015).

18912945 is a wasteful number, since it uses less digits than its factorization.

18912945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585.

The product of its digits is 25920, while the sum is 39.

The square root of 18912945 is about 4348.9015854581. The cubic root of 18912945 is about 266.4320010210.

The spelling of 18912945 in words is "eighteen million, nine hundred twelve thousand, nine hundred forty-five".