8972021 has 4 divisors (see below), whose sum is σ = 9059232. Its totient is φ = 8884812.

The previous prime is 8971979. The next prime is 8972023. The reversal of 8972021 is 1202798.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8972021 - 2¹⁴ = 8955637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8972023) 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 3 ways as a sum of consecutive naturals, for example, 43451 + ... + 43656.

It is an arithmetic number, because the mean of its divisors is an integer number (2264808).

Almost surely, 2^8972021 is an apocalyptic number.

It is an amenable number.

8972021 is a deficient number, since it is larger than the sum of its proper divisors (87211).

8972021 is a wasteful number, since it uses less digits than its factorization.

8972021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87210.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 8972021 is about 2995.3332035017. Note that the first 3 decimals coincide. The cubic root of 8972021 is about 207.7926079401.

The spelling of 8972021 in words is "eight million, nine hundred seventy-two thousand, twenty-one".