8221388 has 12 divisors (see below), whose sum is σ = 16442832. Its totient is φ = 3523440.

The previous prime is 8221349. The next prime is 8221391. The reversal of 8221388 is 8831228.

8221388 is an admirable number.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146783 + ... + 146838.

It is an arithmetic number, because the mean of its divisors is an integer number (1370236).

Almost surely, 2^8221388 is an apocalyptic number.

It is an amenable number.

8221388 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

8221388 is a wasteful number, since it uses less digits than its factorization.

8221388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293632 (or 293630 counting only the distinct ones).

The product of its digits is 6144, while the sum is 32.

The square root of 8221388 is about 2867.2962874457. The cubic root of 8221388 is about 201.8281386307.

The spelling of 8221388 in words is "eight million, two hundred twenty-one thousand, three hundred eighty-eight".