18164745 has 12 divisors (see below), whose sum is σ = 31485636. Its totient is φ = 9687840.

The previous prime is 18164723. The next prime is 18164753. The reversal of 18164745 is 54746181.

It is a happy number.

18164745 is a `hidden beast` number, since 1 + 8 + 1 + 647 + 4 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9290304 + 8874441 = 3048^2 + 2979^2 .

It is not a de Polignac number, because 18164745 - 2¹⁵ = 18131977 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 201786 + ... + 201875.

It is an arithmetic number, because the mean of its divisors is an integer number (2623803).

Almost surely, 2^18164745 is an apocalyptic number.

18164745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18164745 is a deficient number, since it is larger than the sum of its proper divisors (13320891).

18164745 is a wasteful number, since it uses less digits than its factorization.

18164745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403672 (or 403669 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 18164745 is about 4262.0118488808. The cubic root of 18164745 is about 262.8712569920.

It can be divided in two parts, 1816 and 4745, that added together give a 8-th power (6561 = 3⁸).

The spelling of 18164745 in words is "eighteen million, one hundred sixty-four thousand, seven hundred forty-five".