84523420 has 12 divisors (see below), whose sum is σ = 177499224. Its totient is φ = 33809360.

The previous prime is 84523399. The next prime is 84523451. The reversal of 84523420 is 2432548.

It is a congruent number.

It is an unprimeable number.

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, 2113066 + ... + 2113105.

It is an arithmetic number, because the mean of its divisors is an integer number (14791602).

Almost surely, 2^84523420 is an apocalyptic number.

It is an amenable number.

84523420 is an abundant number, since it is smaller than the sum of its proper divisors (92975804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

84523420 is a wasteful number, since it uses less digits than its factorization.

84523420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4226180 (or 4226178 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 84523420 is about 9193.6619472330. The cubic root of 84523420 is about 438.8596850253.

Adding to 84523420 its reverse (2432548), we get a palindrome (86955968).

The spelling of 84523420 in words is "eighty-four million, five hundred twenty-three thousand, four hundred twenty".