18756545 has 4 divisors (see below), whose sum is σ = 22507860. Its totient is φ = 15005232.

The previous prime is 18756511. The next prime is 18756587. The reversal of 18756545 is 54565781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54565781 = 61 ⋅894521.

It can be written as a sum of positive squares in 2 ways, for example, as 2337841 + 16418704 = 1529^2 + 4052^2 .

It is a cyclic number.

It is not a de Polignac number, because 18756545 - 2⁸ = 18756289 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1875650 + ... + 1875659.

It is an arithmetic number, because the mean of its divisors is an integer number (5626965).

Almost surely, 2^18756545 is an apocalyptic number.

It is an amenable number.

18756545 is a deficient number, since it is larger than the sum of its proper divisors (3751315).

18756545 is an equidigital number, since it uses as much as digits as its factorization.

18756545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3751314.

The product of its digits is 168000, while the sum is 41.

The square root of 18756545 is about 4330.8827044842. The cubic root of 18756545 is about 265.6955502567.

The spelling of 18756545 in words is "eighteen million, seven hundred fifty-six thousand, five hundred forty-five".