8490021 has 8 divisors (see below), whose sum is σ = 11985984. Its totient is φ = 5327040.

The previous prime is 8490019. The next prime is 8490023. The reversal of 8490021 is 1200948.

It is an interprime number because it is at equal distance from previous prime (8490019) and next prime (8490023).

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

It is not a de Polignac number, because 8490021 - 2¹ = 8490019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8489973 and 8490000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8490023) 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, 83185 + ... + 83286.

It is an arithmetic number, because the mean of its divisors is an integer number (1498248).

Almost surely, 2^8490021 is an apocalyptic number.

It is an amenable number.

8490021 is a deficient number, since it is larger than the sum of its proper divisors (3495963).

8490021 is a wasteful number, since it uses less digits than its factorization.

8490021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166491.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 8490021 is about 2913.7640604551. The cubic root of 8490021 is about 204.0028594370.

Adding to 8490021 its reverse (1200948), we get a palindrome (9690969).

The spelling of 8490021 in words is "eight million, four hundred ninety thousand, twenty-one".