8978021 has 12 divisors (see below), whose sum is σ = 9878316. Its totient is φ = 8111040.

The previous prime is 8977961. The next prime is 8978059. The reversal of 8978021 is 1208798.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3150625 + 5827396 = 1775^2 + 2414^2 .

It is not a de Polignac number, because 8978021 - 2⁶ = 8977957 is a prime.

It is a super-2 number, since 2×8978021² = 161209722152882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8978071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65465 + ... + 65601.

It is an arithmetic number, because the mean of its divisors is an integer number (823193).

Almost surely, 2^8978021 is an apocalyptic number.

It is an amenable number.

8978021 is a deficient number, since it is larger than the sum of its proper divisors (900295).

8978021 is a wasteful number, since it uses less digits than its factorization.

8978021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 8978021 is about 2996.3345941333. The cubic root of 8978021 is about 207.8389177526.

The spelling of 8978021 in words is "eight million, nine hundred seventy-eight thousand, twenty-one".