18813073 has 4 divisors (see below), whose sum is σ = 18985780. Its totient is φ = 18640368.

The previous prime is 18813043. The next prime is 18813077. The reversal of 18813073 is 37031881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37031881 = 59 ⋅627659.

It can be written as a sum of positive squares in 2 ways, for example, as 4915089 + 13897984 = 2217^2 + 3728^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18813073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18813077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86190 + ... + 86407.

It is an arithmetic number, because the mean of its divisors is an integer number (4746445).

Almost surely, 2^18813073 is an apocalyptic number.

It is an amenable number.

18813073 is a deficient number, since it is larger than the sum of its proper divisors (172707).

18813073 is a wasteful number, since it uses less digits than its factorization.

18813073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172706.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 18813073 is about 4337.4039470633. The cubic root of 18813073 is about 265.9621980691.

The spelling of 18813073 in words is "eighteen million, eight hundred thirteen thousand, seventy-three".