8421604 has 9 divisors (see below), whose sum is σ = 14747971. Its totient is φ = 4207900.

The previous prime is 8421587. The next prime is 8421619. The reversal of 8421604 is 4061248.

The square root of 8421604 is 2902.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5079 + ... + 6529.

Almost surely, 2^8421604 is an apocalyptic number.

8421604 is the 2902-nd square number.

It is an amenable number.

8421604 is a deficient number, since it is larger than the sum of its proper divisors (6326367).

8421604 is an equidigital number, since it uses as much as digits as its factorization.

8421604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2906 (or 1453 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The cubic root of 8421604 is about 203.4533938147.

Multiplying 8421604 by its sum of digits (25), we get a square (210540100 = 14510²).

It can be divided in two parts, 8421 and 604, that added together give a square (9025 = 95²).

The spelling of 8421604 in words is "eight million, four hundred twenty-one thousand, six hundred four".