18500474 has 4 divisors (see below), whose sum is σ = 27750714. Its totient is φ = 9250236.

The previous prime is 18500431. The next prime is 18500477. The reversal of 18500474 is 47400581.

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

It can be written as a sum of positive squares in only one way, i.e., 18190225 + 310249 = 4265^2 + 557^2 .

It is not an unprimeable number, because it can be changed into a prime (18500477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4625117 + ... + 4625120.

Almost surely, 2^18500474 is an apocalyptic number.

18500474 is a deficient number, since it is larger than the sum of its proper divisors (9250240).

18500474 is an equidigital number, since it uses as much as digits as its factorization.

18500474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9250239.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 18500474 is about 4301.2177345491. The cubic root of 18500474 is about 264.4808824058.

The spelling of 18500474 in words is "eighteen million, five hundred thousand, four hundred seventy-four".