18847998 has 32 divisors (see below), whose sum is σ = 45108000. Its totient is φ = 5799168.

The previous prime is 18847993. The next prime is 18848003. The reversal of 18847998 is 89974881.

18847998 is a `hidden beast` number, since 1 + 88 + 479 + 98 = 666.

It is an interprime number because it is at equal distance from previous prime (18847993) and next prime (18848003).

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18847991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12723 + ... + 14126.

It is an arithmetic number, because the mean of its divisors is an integer number (1409625).

Almost surely, 2^18847998 is an apocalyptic number.

18847998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18847998 is an abundant number, since it is smaller than the sum of its proper divisors (26260002).

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

18847998 is a wasteful number, since it uses less digits than its factorization.

18847998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26873 (or 26867 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 54.

The square root of 18847998 is about 4341.4281060499. The cubic root of 18847998 is about 266.1266756773.

The spelling of 18847998 in words is "eighteen million, eight hundred forty-seven thousand, nine hundred ninety-eight".