2186240 has 88 divisors (see below), whose sum is σ = 6091872. Its totient is φ = 737280.

The previous prime is 2186231. The next prime is 2186269. The reversal of 2186240 is 426812.

It is a congruent number.

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, 35810 + ... + 35870.

2^2186240 is an apocalyptic number.

2186240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

2186240 is the 854-th octagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2186240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3045936).

2186240 is an abundant number, since it is smaller than the sum of its proper divisors (3905632).

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

2186240 is an equidigital number, since it uses as much as digits as its factorization.

2186240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 2186240 is about 1478.5939266749. The cubic root of 2186240 is about 129.7874237877.

The spelling of 2186240 in words is "two million, one hundred eighty-six thousand, two hundred forty".