8921390 has 16 divisors (see below), whose sum is σ = 16331760. Its totient is φ = 3507840.

The previous prime is 8921389. The next prime is 8921417. The reversal of 8921390 is 931298.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6971 + ... + 8150.

It is an arithmetic number, because the mean of its divisors is an integer number (1020735).

Almost surely, 2^8921390 is an apocalyptic number.

8921390 is a deficient number, since it is larger than the sum of its proper divisors (7410370).

8921390 is a wasteful number, since it uses less digits than its factorization.

8921390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15187.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 8921390 is about 2986.8695987605. The cubic root of 8921390 is about 207.4009979162.

The spelling of 8921390 in words is "eight million, nine hundred twenty-one thousand, three hundred ninety".