899821 has 8 divisors (see below), whose sum is σ = 1020320. Its totient is φ = 786672.

The previous prime is 899807. The next prime is 899831. The reversal of 899821 is 128998.

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

It is a cyclic number.

It is not a de Polignac number, because 899821 - 2⁷ = 899693 is a prime.

It is a Duffinian number.

899821 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (899831) 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, 1575 + ... + 2068.

It is an arithmetic number, because the mean of its divisors is an integer number (127540).

2⁸⁹⁹⁸²¹ is an apocalyptic number.

It is an amenable number.

899821 is a deficient number, since it is larger than the sum of its proper divisors (120499).

899821 is a wasteful number, since it uses less digits than its factorization.

899821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3675.

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

The square root of 899821 is about 948.5889520757. The cubic root of 899821 is about 96.5425371991.

The spelling of 899821 in words is "eight hundred ninety-nine thousand, eight hundred twenty-one".