8921890 has 8 divisors (see below), whose sum is σ = 16059420. Its totient is φ = 3568752.

The previous prime is 8921873. The next prime is 8921911. The reversal of 8921890 is 981298.

It can be written as a sum of positive squares in 2 ways, for example, as 8814961 + 106929 = 2969^2 + 327^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 446085 + ... + 446104.

Almost surely, 2^8921890 is an apocalyptic number.

8921890 is a deficient number, since it is larger than the sum of its proper divisors (7137530).

8921890 is a wasteful number, since it uses less digits than its factorization.

8921890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892196.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 8921890 is about 2986.9532972579. The cubic root of 8921890 is about 207.4048724456.

The spelling of 8921890 in words is "eight million, nine hundred twenty-one thousand, eight hundred ninety".