18573145 has 4 divisors (see below), whose sum is σ = 22287780. Its totient is φ = 14858512.

The previous prime is 18573109. The next prime is 18573157. The reversal of 18573145 is 54137581.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54137581 = 139 ⋅389479.

It can be written as a sum of positive squares in 2 ways, for example, as 11978521 + 6594624 = 3461^2 + 2568^2 .

It is a cyclic number.

It is not a de Polignac number, because 18573145 - 2¹⁵ = 18540377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18573145.

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, 1857310 + ... + 1857319.

It is an arithmetic number, because the mean of its divisors is an integer number (5571945).

Almost surely, 2^18573145 is an apocalyptic number.

It is an amenable number.

18573145 is a deficient number, since it is larger than the sum of its proper divisors (3714635).

18573145 is an equidigital number, since it uses as much as digits as its factorization.

18573145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3714634.

The product of its digits is 16800, while the sum is 34.

The square root of 18573145 is about 4309.6571789413. The cubic root of 18573145 is about 264.8267290236.

The spelling of 18573145 in words is "eighteen million, five hundred seventy-three thousand, one hundred forty-five".