8421442 has 4 divisors (see below), whose sum is σ = 12632166. Its totient is φ = 4210720.

The previous prime is 8421419. The next prime is 8421463. The reversal of 8421442 is 2441248.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 5669161 + 2752281 = 2381^2 + 1659^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2105359 + ... + 2105362.

Almost surely, 2^8421442 is an apocalyptic number.

8421442 is a deficient number, since it is larger than the sum of its proper divisors (4210724).

8421442 is a wasteful number, since it uses less digits than its factorization.

8421442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4210723.

The product of its digits is 2048, while the sum is 25.

The square root of 8421442 is about 2901.9720880808. The cubic root of 8421442 is about 203.4520892469.

The spelling of 8421442 in words is "eight million, four hundred twenty-one thousand, four hundred forty-two".