283921 has 8 divisors (see below), whose sum is σ = 316224. Its totient is φ = 252720.

The previous prime is 283909. The next prime is 283937. The reversal of 283921 is 129382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 5-Lehmer number, since φ(283921) divides (283921-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 283921 - 2⁷ = 283793 is a prime.

It is a super-2 number, since 2×283921² = 161222268482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (283961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340 + ... + 826.

It is an arithmetic number, because the mean of its divisors is an integer number (39528).

2²⁸³⁹²¹ is an apocalyptic number.

It is an amenable number.

283921 is a deficient number, since it is larger than the sum of its proper divisors (32303).

283921 is a wasteful number, since it uses less digits than its factorization.

283921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551.

The product of its digits is 864, while the sum is 25.

The square root of 283921 is about 532.8423781945. The cubic root of 283921 is about 65.7252891377.

The spelling of 283921 in words is "two hundred eighty-three thousand, nine hundred twenty-one".