2178240 has 56 divisors (see below), whose sum is σ = 6918960. Its totient is φ = 580608.

The previous prime is 2178223. The next prime is 2178257. The reversal of 2178240 is 428712.

It is an interprime number because it is at equal distance from previous prime (2178223) and next prime (2178257).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 2178240.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175 + ... + 2094.

2^2178240 is an apocalyptic number.

2178240 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 2178240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3459480).

2178240 is an abundant number, since it is smaller than the sum of its proper divisors (4740720).

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

2178240 is a wasteful number, since it uses less digits than its factorization.

2178240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2289 (or 2279 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 2178240 is about 1475.8861744728. The cubic root of 2178240 is about 129.6289220621.

The spelling of 2178240 in words is "two million, one hundred seventy-eight thousand, two hundred forty".