8921408 has 14 divisors (see below), whose sum is σ = 17703546. Its totient is φ = 4460672.

The previous prime is 8921389. The next prime is 8921417. The reversal of 8921408 is 8041298.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 6512704 + 2408704 = 2552^2 + 1552^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69635 + ... + 69762.

It is an arithmetic number, because the mean of its divisors is an integer number (1264539).

Almost surely, 2^8921408 is an apocalyptic number.

It is an amenable number.

8921408 is a deficient number, since it is larger than the sum of its proper divisors (8782138).

8921408 is a wasteful number, since it uses less digits than its factorization.

8921408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139409 (or 139399 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 8921408 is about 2986.8726119472. The cubic root of 8921408 is about 207.4011374018.

The spelling of 8921408 in words is "eight million, nine hundred twenty-one thousand, four hundred eight".