890021 has 4 divisors (see below), whose sum is σ = 970944. Its totient is φ = 809100.

The previous prime is 890011. The next prime is 890027. The reversal of 890021 is 120098.

890021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 890021 - 2⁶ = 889957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 889975 and 890002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (890027) 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, 40445 + ... + 40466.

It is an arithmetic number, because the mean of its divisors is an integer number (242736).

2⁸⁹⁰⁰²¹ is an apocalyptic number.

It is an amenable number.

890021 is a deficient number, since it is larger than the sum of its proper divisors (80923).

890021 is a wasteful number, since it uses less digits than its factorization.

890021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80922.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 890021 is about 943.4092431177. The cubic root of 890021 is about 96.1907737055.

The spelling of 890021 in words is "eight hundred ninety thousand, twenty-one".