84866921 has 4 divisors (see below), whose sum is σ = 86258244. Its totient is φ = 83475600.

The previous prime is 84866911. The next prime is 84866927. The reversal of 84866921 is 12966848.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7778521 + 77088400 = 2789^2 + 8780^2 .

It is a cyclic number.

It is not a de Polignac number, because 84866921 - 2⁶ = 84866857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84866927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 695570 + ... + 695691.

It is an arithmetic number, because the mean of its divisors is an integer number (21564561).

Almost surely, 2^84866921 is an apocalyptic number.

It is an amenable number.

84866921 is a deficient number, since it is larger than the sum of its proper divisors (1391323).

84866921 is a wasteful number, since it uses less digits than its factorization.

84866921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1391322.

The product of its digits is 165888, while the sum is 44.

The square root of 84866921 is about 9212.3244080959. The cubic root of 84866921 is about 439.4533863035.

The spelling of 84866921 in words is "eighty-four million, eight hundred sixty-six thousand, nine hundred twenty-one".