899021 has 4 divisors (see below), whose sum is σ = 901344. Its totient is φ = 896700.

The previous prime is 899009. The next prime is 899051. The reversal of 899021 is 120998.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 899021 - 2¹⁸ = 636877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (899051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 425 + ... + 1406.

It is an arithmetic number, because the mean of its divisors is an integer number (225336).

2⁸⁹⁹⁰²¹ is an apocalyptic number.

It is an amenable number.

899021 is a deficient number, since it is larger than the sum of its proper divisors (2323).

899021 is a wasteful number, since it uses less digits than its factorization.

899021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2322.

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

The square root of 899021 is about 948.1671793518. The cubic root of 899021 is about 96.5139178294.

The spelling of 899021 in words is "eight hundred ninety-nine thousand, twenty-one".