18504845 has 4 divisors (see below), whose sum is σ = 22205820. Its totient is φ = 14803872.

The previous prime is 18504839. The next prime is 18504851. The reversal of 18504845 is 54840581.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (18504839) and next prime (18504851).

It can be written as a sum of positive squares in 2 ways, for example, as 7409284 + 11095561 = 2722^2 + 3331^2 .

It is a cyclic number.

It is not a de Polignac number, because 18504845 - 2⁸ = 18504589 is a prime.

It is a congruent number.

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, 1850480 + ... + 1850489.

It is an arithmetic number, because the mean of its divisors is an integer number (5551455).

Almost surely, 2^18504845 is an apocalyptic number.

It is an amenable number.

18504845 is a deficient number, since it is larger than the sum of its proper divisors (3700975).

18504845 is an equidigital number, since it uses as much as digits as its factorization.

18504845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3700974.

The product of its (nonzero) digits is 25600, while the sum is 35.

The square root of 18504845 is about 4301.7258164602. The cubic root of 18504845 is about 264.5017098885.

The spelling of 18504845 in words is "eighteen million, five hundred four thousand, eight hundred forty-five".