18873690 has 32 divisors (see below), whose sum is σ = 49415616. Its totient is φ = 4575360.

The previous prime is 18873661. The next prime is 18873691. The reversal of 18873690 is 9637881.

It is a super-2 number, since 2×18873690² = 712432348432200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18873691) 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 15 ways as a sum of consecutive naturals, for example, 28267 + ... + 28926.

It is an arithmetic number, because the mean of its divisors is an integer number (1544238).

Almost surely, 2^18873690 is an apocalyptic number.

18873690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18873690 is an abundant number, since it is smaller than the sum of its proper divisors (30541926).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18873690 is a wasteful number, since it uses less digits than its factorization.

18873690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57214.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 18873690 is about 4344.3860325712. The cubic root of 18873690 is about 266.2475412500.

The spelling of 18873690 in words is "eighteen million, eight hundred seventy-three thousand, six hundred ninety".