18749145 has 8 divisors (see below), whose sum is σ = 29998656. Its totient is φ = 9999536.

The previous prime is 18749131. The next prime is 18749153. The reversal of 18749145 is 54194781.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18749145 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 624957 + ... + 624986.

It is an arithmetic number, because the mean of its divisors is an integer number (3749832).

Almost surely, 2^18749145 is an apocalyptic number.

18749145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18749145 is a deficient number, since it is larger than the sum of its proper divisors (11249511).

18749145 is a wasteful number, since it uses less digits than its factorization.

18749145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249951.

The product of its digits is 40320, while the sum is 39.

The square root of 18749145 is about 4330.0282909006. The cubic root of 18749145 is about 265.6606041317.

The spelling of 18749145 in words is "eighteen million, seven hundred forty-nine thousand, one hundred forty-five".