994021 has 8 divisors (see below), whose sum is σ = 1143104. Its totient is φ = 846720.

The previous prime is 994013. The next prime is 994027. The reversal of 994021 is 120499.

994021 is nontrivially palindromic in base 3.

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

It is not a de Polignac number, because 994021 - 2³ = 994013 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (994027) 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, 1141 + ... + 1813.

It is an arithmetic number, because the mean of its divisors is an integer number (142888).

2⁹⁹⁴⁰²¹ is an apocalyptic number.

It is an amenable number.

994021 is a deficient number, since it is larger than the sum of its proper divisors (149083).

994021 is a wasteful number, since it uses less digits than its factorization.

994021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 994021 is about 997.0060180360. The cubic root of 994021 is about 99.8003014704.

The spelling of 994021 in words is "nine hundred ninety-four thousand, twenty-one".