84180340 has 12 divisors (see below), whose sum is σ = 176778756. Its totient is φ = 33672128.

The previous prime is 84180329. The next prime is 84180361. The reversal of 84180340 is 4308148.

It can be written as a sum of positive squares in 2 ways, for example, as 28259856 + 55920484 = 5316^2 + 7478^2 .

It is a junction number, because it is equal to n+sod(n) for n = 84180299 and 84180308.

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, 2104489 + ... + 2104528.

It is an arithmetic number, because the mean of its divisors is an integer number (14731563).

Almost surely, 2^84180340 is an apocalyptic number.

It is an amenable number.

84180340 is an abundant number, since it is smaller than the sum of its proper divisors (92598416).

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

84180340 is a wasteful number, since it uses less digits than its factorization.

84180340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4209026 (or 4209024 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 84180340 is about 9174.9844686517. The cubic root of 84180340 is about 438.2651036494.

Adding to 84180340 its reverse (4308148), we get a palindrome (88488488).

The spelling of 84180340 in words is "eighty-four million, one hundred eighty thousand, three hundred forty".