281998 has 16 divisors (see below), whose sum is σ = 458640. Its totient is φ = 129600.

The previous prime is 281993. The next prime is 282001. The reversal of 281998 is 899182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1468 + ... + 1648.

It is an arithmetic number, because the mean of its divisors is an integer number (28665).

2²⁸¹⁹⁹⁸ is an apocalyptic number.

281998 is a deficient number, since it is larger than the sum of its proper divisors (176642).

281998 is a wasteful number, since it uses less digits than its factorization.

281998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243.

The product of its digits is 10368, while the sum is 37.

The square root of 281998 is about 531.0348387818. The cubic root of 281998 is about 65.5765668336.

Subtracting from 281998 its sum of digits (37), we obtain a square (281961 = 531²).

The spelling of 281998 in words is "two hundred eighty-one thousand, nine hundred ninety-eight".