2178340 has 12 divisors (see below), whose sum is σ = 4574556. Its totient is φ = 871328.

The previous prime is 2178313. The next prime is 2178343. The reversal of 2178340 is 438712.

It can be written as a sum of positive squares in 2 ways, for example, as 1597696 + 580644 = 1264^2 + 762^2 .

It is not an unprimeable number, because it can be changed into a prime (2178343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54439 + ... + 54478.

It is an arithmetic number, because the mean of its divisors is an integer number (381213).

2^2178340 is an apocalyptic number.

2178340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2178340 is an abundant number, since it is smaller than the sum of its proper divisors (2396216).

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

2178340 is a wasteful number, since it uses less digits than its factorization.

2178340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108926 (or 108924 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 2178340 is about 1475.9200520353. The cubic root of 2178340 is about 129.6309057269.

The spelling of 2178340 in words is "two million, one hundred seventy-eight thousand, three hundred forty".