8421388 has 6 divisors (see below), whose sum is σ = 14737436. Its totient is φ = 4210692.

The previous prime is 8421251. The next prime is 8421403. The reversal of 8421388 is 8831248.

It is a d-powerful number, because it can be written as 8 + 4¹¹ + 2²¹ + 1 + 3 + 8⁵ + 8⁷ .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052670 + ... + 1052677.

Almost surely, 2^8421388 is an apocalyptic number.

It is an amenable number.

8421388 is a deficient number, since it is larger than the sum of its proper divisors (6316048).

8421388 is a wasteful number, since it uses less digits than its factorization.

8421388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2105351 (or 2105349 counting only the distinct ones).

The product of its digits is 12288, while the sum is 34.

The square root of 8421388 is about 2901.9627840481. The cubic root of 8421388 is about 203.4516543872.

The spelling of 8421388 in words is "eight million, four hundred twenty-one thousand, three hundred eighty-eight".