281998005 has 16 divisors (see below), whose sum is σ = 456910080. Its totient is φ = 148494528.

The previous prime is 281997977. The next prime is 281998007. The reversal of 281998005 is 500899182.

It is a happy number.

It is not a de Polignac number, because 281998005 - 2⁵ = 281997973 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281998007) 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, 117802 + ... + 120171.

It is an arithmetic number, because the mean of its divisors is an integer number (28556880).

Almost surely, 2^281998005 is an apocalyptic number.

It is an amenable number.

281998005 is a deficient number, since it is larger than the sum of its proper divisors (174912075).

281998005 is a wasteful number, since it uses less digits than its factorization.

281998005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238060.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 281998005 is about 16792.7962233810. The cubic root of 281998005 is about 655.7656722119.

The spelling of 281998005 in words is "two hundred eighty-one million, nine hundred ninety-eight thousand, five".