8198421 has 16 divisors (see below), whose sum is σ = 13628928. Its totient is φ = 4258800.

The previous prime is 8198389. The next prime is 8198459. The reversal of 8198421 is 1248918.

It is not a de Polignac number, because 8198421 - 2⁵ = 8198389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8198221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17515 + ... + 17976.

It is an arithmetic number, because the mean of its divisors is an integer number (851808).

Almost surely, 2^8198421 is an apocalyptic number.

It is an amenable number.

8198421 is a deficient number, since it is larger than the sum of its proper divisors (5430507).

8198421 is a wasteful number, since it uses less digits than its factorization.

8198421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35512.

The product of its digits is 4608, while the sum is 33.

The square root of 8198421 is about 2863.2884940222. The cubic root of 8198421 is about 201.6400231935.

The spelling of 8198421 in words is "eight million, one hundred ninety-eight thousand, four hundred twenty-one".