8421740 has 24 divisors (see below), whose sum is σ = 17744832. Its totient is φ = 3357440.

The previous prime is 8421737. The next prime is 8421757. The reversal of 8421740 is 471248.

It is a d-powerful number, because it can be written as 8⁵ + 4 + 2²³ + 1 + 7³ + 4² + 0 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8132 + ... + 9108.

It is an arithmetic number, because the mean of its divisors is an integer number (739368).

Almost surely, 2^8421740 is an apocalyptic number.

It is an amenable number.

8421740 is an abundant number, since it is smaller than the sum of its proper divisors (9323092).

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

8421740 is a wasteful number, since it uses less digits than its factorization.

8421740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1417 (or 1415 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 8421740 is about 2902.0234320212. The cubic root of 8421740 is about 203.4544889946.

Adding to 8421740 its reverse (471248), we get a palindrome (8892988).

The spelling of 8421740 in words is "eight million, four hundred twenty-one thousand, seven hundred forty".