18998928 has 160 divisors (see below), whose sum is σ = 62496000. Its totient is φ = 5474304.

The previous prime is 18998923. The next prime is 18998933. The reversal of 18998928 is 82989981.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18998923) and next prime (18998933).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (18998921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95373 + ... + 95571.

It is an arithmetic number, because the mean of its divisors is an integer number (390600).

Almost surely, 2^18998928 is an apocalyptic number.

18998928 is a gapful number since it is divisible by the number (18) 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 18998928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31248000).

18998928 is an abundant number, since it is smaller than the sum of its proper divisors (43497072).

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

18998928 is a wasteful number, since it uses less digits than its factorization.

18998928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246 (or 234 counting only the distinct ones).

The product of its digits is 746496, while the sum is 54.

The square root of 18998928 is about 4358.7759749728. The cubic root of 18998928 is about 266.8351463101.

The spelling of 18998928 in words is "eighteen million, nine hundred ninety-eight thousand, nine hundred twenty-eight".