8370421 has 4 divisors (see below), whose sum is σ = 8456812. Its totient is φ = 8284032.

The previous prime is 8370407. The next prime is 8370433. The reversal of 8370421 is 1240738.

8370421 is digitally balanced in base 3, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 1347921 + 7022500 = 1161^2 + 2650^2 .

It is a cyclic number.

It is not a de Polignac number, because 8370421 - 2⁷ = 8370293 is a prime.

It is a Duffinian number.

8370421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8370491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43050 + ... + 43243.

It is an arithmetic number, because the mean of its divisors is an integer number (2114203).

Almost surely, 2^8370421 is an apocalyptic number.

It is an amenable number.

8370421 is a deficient number, since it is larger than the sum of its proper divisors (86391).

8370421 is an equidigital number, since it uses as much as digits as its factorization.

8370421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86390.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 8370421 is about 2893.1679868269. The cubic root of 8370421 is about 203.0403876706.

The spelling of 8370421 in words is "eight million, three hundred seventy thousand, four hundred twenty-one".