281990 has 16 divisors (see below), whose sum is σ = 513648. Its totient is φ = 111456.

The previous prime is 281989. The next prime is 281993. The reversal of 281990 is 99182.

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, 1544 + ... + 1716.

It is an arithmetic number, because the mean of its divisors is an integer number (32103).

2²⁸¹⁹⁹⁰ is an apocalyptic number.

281990 is a deficient number, since it is larger than the sum of its proper divisors (231658).

281990 is a wasteful number, since it uses less digits than its factorization.

281990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 281990 is about 531.0273062659. The cubic root of 281990 is about 65.5759467140.

Subtracting from 281990 its sum of digits (29), we obtain a square (281961 = 531²).

The spelling of 281990 in words is "two hundred eighty-one thousand, nine hundred ninety".