18912745 has 16 divisors (see below), whose sum is σ = 23480640. Its totient is φ = 14616000.

The previous prime is 18912731. The next prime is 18912749. The reversal of 18912745 is 54721981.

It is not a de Polignac number, because 18912745 - 2⁷ = 18912617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18912749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17470 + ... + 18520.

It is an arithmetic number, because the mean of its divisors is an integer number (1467540).

Almost surely, 2^18912745 is an apocalyptic number.

It is an amenable number.

18912745 is a deficient number, since it is larger than the sum of its proper divisors (4567895).

18912745 is a wasteful number, since it uses less digits than its factorization.

18912745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176.

The product of its digits is 20160, while the sum is 37.

The square root of 18912745 is about 4348.8785910853. The cubic root of 18912745 is about 266.4310618655.

The spelling of 18912745 in words is "eighteen million, nine hundred twelve thousand, seven hundred forty-five".