8421620 has 12 divisors (see below), whose sum is σ = 17685444. Its totient is φ = 3368640.

The previous prime is 8421619. The next prime is 8421641. The reversal of 8421620 is 261248.

It can be written as a sum of positive squares in 2 ways, for example, as 3020644 + 5400976 = 1738^2 + 2324^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 210521 + ... + 210560.

It is an arithmetic number, because the mean of its divisors is an integer number (1473787).

Almost surely, 2^8421620 is an apocalyptic number.

It is an amenable number.

8421620 is an abundant number, since it is smaller than the sum of its proper divisors (9263824).

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

8421620 is a wasteful number, since it uses less digits than its factorization.

8421620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421090 (or 421088 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 8421620 is about 2902.0027567182. The cubic root of 8421620 is about 203.4535226600.

Adding to 8421620 its reverse (261248), we get a palindrome (8682868).

The spelling of 8421620 in words is "eight million, four hundred twenty-one thousand, six hundred twenty".