18364473 has 6 divisors (see below), whose sum is σ = 26526474. Its totient is φ = 12242976.

The previous prime is 18364457. The next prime is 18364481. The reversal of 18364473 is 37446381.

18364473 is a `hidden beast` number, since 1 + 8 + 3 + 644 + 7 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16426809 + 1937664 = 4053^2 + 1392^2 .

It is not a de Polignac number, because 18364473 - 2⁴ = 18364457 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18362473) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1020240 + ... + 1020257.

It is an arithmetic number, because the mean of its divisors is an integer number (4421079).

Almost surely, 2^18364473 is an apocalyptic number.

It is an amenable number.

18364473 is a deficient number, since it is larger than the sum of its proper divisors (8162001).

18364473 is a wasteful number, since it uses less digits than its factorization.

18364473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040503 (or 2040500 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 18364473 is about 4285.3789797403. The cubic root of 18364473 is about 263.8312023580.

The spelling of 18364473 in words is "eighteen million, three hundred sixty-four thousand, four hundred seventy-three".