84170420 has 48 divisors (see below), whose sum is σ = 182020608. Its totient is φ = 32678400.

The previous prime is 84170407. The next prime is 84170431. The reversal of 84170420 is 2407148.

It is a self number, because there is not a number n which added to its sum of digits gives 84170420.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141644 + ... + 142236.

It is an arithmetic number, because the mean of its divisors is an integer number (3792096).

Almost surely, 2^84170420 is an apocalyptic number.

It is an amenable number.

84170420 is an abundant number, since it is smaller than the sum of its proper divisors (97850188).

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

84170420 is a wasteful number, since it uses less digits than its factorization.

84170420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800 (or 798 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 84170420 is about 9174.4438523542. The cubic root of 84170420 is about 438.2478875923.

Adding to 84170420 its reverse (2407148), we get a palindrome (86577568).

The spelling of 84170420 in words is "eighty-four million, one hundred seventy thousand, four hundred twenty".