2178120 has 64 divisors (see below), whose sum is σ = 7470720. Its totient is φ = 497664.

The previous prime is 2178083. The next prime is 2178131. The reversal of 2178120 is 218712.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 457 + ... + 2136.

It is an arithmetic number, because the mean of its divisors is an integer number (116730).

2^2178120 is an apocalyptic number.

2178120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2178120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3735360).

2178120 is an abundant number, since it is smaller than the sum of its proper divisors (5292600).

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

2178120 is a wasteful number, since it uses less digits than its factorization.

2178120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2614 (or 2610 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 2178120 is about 1475.8455203713. The cubic root of 2178120 is about 129.6265415843.

The spelling of 2178120 in words is "two million, one hundred seventy-eight thousand, one hundred twenty".