84240840 has 32 divisors (see below), whose sum is σ = 252722880. Its totient is φ = 22464192.

The previous prime is 84240829. The next prime is 84240859. The reversal of 84240840 is 4804248.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 84240798 and 84240807.

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 7 ways as a sum of consecutive naturals, for example, 350884 + ... + 351123.

It is an arithmetic number, because the mean of its divisors is an integer number (7897590).

Almost surely, 2^84240840 is an apocalyptic number.

It is an amenable number.

84240840 is an abundant number, since it is smaller than the sum of its proper divisors (168482040).

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

84240840 is a wasteful number, since it uses less digits than its factorization.

84240840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702021 (or 702017 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 30.

The square root of 84240840 is about 9178.2808847845. The cubic root of 84240840 is about 438.3700715046.

The spelling of 84240840 in words is "eighty-four million, two hundred forty thousand, eight hundred forty".