18873290 has 16 divisors (see below), whose sum is σ = 34323912. Its totient is φ = 7471104.

The previous prime is 18873227. The next prime is 18873299. The reversal of 18873290 is 9237881.

It can be written as a sum of positive squares in 4 ways, for example, as 16999129 + 1874161 = 4123^2 + 1369^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18873299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8759 + ... + 10698.

Almost surely, 2^18873290 is an apocalyptic number.

18873290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18873290 is a deficient number, since it is larger than the sum of its proper divisors (15450622).

18873290 is a wasteful number, since it uses less digits than its factorization.

18873290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19561.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 18873290 is about 4344.3399959027. The cubic root of 18873290 is about 266.2456603288.

The spelling of 18873290 in words is "eighteen million, eight hundred seventy-three thousand, two hundred ninety".