8421642 has 12 divisors (see below), whose sum is σ = 18246930. Its totient is φ = 2807208.

The previous prime is 8421641. The next prime is 8421653. The reversal of 8421642 is 2461248.

8421642 = 224² + 225² + ... + 331².

It can be written as a sum of positive squares in only one way, i.e., 6702921 + 1718721 = 2589^2 + 1311^2 .

It is not an unprimeable number, because it can be changed into a prime (8421641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 233917 + ... + 233952.

Almost surely, 2^8421642 is an apocalyptic number.

8421642 is an abundant number, since it is smaller than the sum of its proper divisors (9825288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8421642 is a wasteful number, since it uses less digits than its factorization.

8421642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467877 (or 467874 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 8421642 is about 2902.0065472014. The cubic root of 8421642 is about 203.4536998220.

The spelling of 8421642 in words is "eight million, four hundred twenty-one thousand, six hundred forty-two".