84821895 has 24 divisors (see below), whose sum is σ = 148683600. Its totient is φ = 44727936.

The previous prime is 84821879. The next prime is 84821899. The reversal of 84821895 is 59812848.

It is a happy number.

It is not a de Polignac number, because 84821895 - 2⁴ = 84821879 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 84821895.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84821899) 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 23 ways as a sum of consecutive naturals, for example, 6585 + ... + 14594.

It is an arithmetic number, because the mean of its divisors is an integer number (6195150).

Almost surely, 2^84821895 is an apocalyptic number.

84821895 is a deficient number, since it is larger than the sum of its proper divisors (63861705).

84821895 is a wasteful number, since it uses less digits than its factorization.

84821895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21279 (or 21276 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The square root of 84821895 is about 9209.8802923817. The cubic root of 84821895 is about 439.3756554741.

The spelling of 84821895 in words is "eighty-four million, eight hundred twenty-one thousand, eight hundred ninety-five".