8420642 has 4 divisors (see below), whose sum is σ = 12630966. Its totient is φ = 4210320.

The previous prime is 8420603. The next prime is 8420651. The reversal of 8420642 is 2460248.

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., 5248681 + 3171961 = 2291^2 + 1781^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2105159 + ... + 2105162.

Almost surely, 2^8420642 is an apocalyptic number.

8420642 is a deficient number, since it is larger than the sum of its proper divisors (4210324).

8420642 is a wasteful number, since it uses less digits than its factorization.

8420642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4210323.

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 8420642 is about 2901.8342475062. The cubic root of 8420642 is about 203.4456466913.

It can be divided in two parts, 84206 and 42, that added together give a palindrome (84248).

The spelling of 8420642 in words is "eight million, four hundred twenty thousand, six hundred forty-two".