18928380 has 48 divisors (see below), whose sum is σ = 53907840. Its totient is φ = 4961088.

The previous prime is 18928369. The next prime is 18928409. The reversal of 18928380 is 8382981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 867 + ... + 6213.

It is an arithmetic number, because the mean of its divisors is an integer number (1123080).

Almost surely, 2^18928380 is an apocalyptic number.

18928380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18928380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26953920).

18928380 is an abundant number, since it is smaller than the sum of its proper divisors (34979460).

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

18928380 is a wasteful number, since it uses less digits than its factorization.

18928380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5418 (or 5416 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 18928380 is about 4350.6758095726. The cubic root of 18928380 is about 266.5044603820.

The spelling of 18928380 in words is "eighteen million, nine hundred twenty-eight thousand, three hundred eighty".