18897830 has 24 divisors (see below), whose sum is σ = 39570768. Its totient is φ = 6479088.

The previous prime is 18897811. The next prime is 18897833. The reversal of 18897830 is 3879881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18897833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18794 + ... + 19773.

It is an arithmetic number, because the mean of its divisors is an integer number (1648782).

Almost surely, 2^18897830 is an apocalyptic number.

18897830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18897830 is an abundant number, since it is smaller than the sum of its proper divisors (20672938).

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

18897830 is a wasteful number, since it uses less digits than its factorization.

18897830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38588 (or 38581 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 18897830 is about 4347.1634429821. The cubic root of 18897830 is about 266.3610056792.

The spelling of 18897830 in words is "eighteen million, eight hundred ninety-seven thousand, eight hundred thirty".