84974821 has 4 divisors (see below), whose sum is σ = 89447200. Its totient is φ = 80502444.

The previous prime is 84974807. The next prime is 84974831. The reversal of 84974821 is 12847948.

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 84974821 - 2¹⁹ = 84450533 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 (84974831) 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, 2236161 + ... + 2236198.

It is an arithmetic number, because the mean of its divisors is an integer number (22361800).

Almost surely, 2^84974821 is an apocalyptic number.

It is an amenable number.

84974821 is a deficient number, since it is larger than the sum of its proper divisors (4472379).

84974821 is a wasteful number, since it uses less digits than its factorization.

84974821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4472378.

The product of its digits is 129024, while the sum is 43.

The square root of 84974821 is about 9218.1788331535. The cubic root of 84974821 is about 439.6395481148.

The spelling of 84974821 in words is "eighty-four million, nine hundred seventy-four thousand, eight hundred twenty-one".