2186840 has 32 divisors (see below), whose sum is σ = 5136480. Its totient is φ = 836352.

The previous prime is 2186839. The next prime is 2186857. The reversal of 2186840 is 486812.

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, 269 + ... + 2108.

It is an arithmetic number, because the mean of its divisors is an integer number (160515).

2^2186840 is an apocalyptic number.

2186840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2186840 is an abundant number, since it is smaller than the sum of its proper divisors (2949640).

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

2186840 is a wasteful number, since it uses less digits than its factorization.

2186840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2411 (or 2407 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 2186840 is about 1478.7968082194. The cubic root of 2186840 is about 129.7992958193.

It can be divided in two parts, 2 and 186840, that multiplied together give a triangular number (373680 = T₈₆₄).

The spelling of 2186840 in words is "two million, one hundred eighty-six thousand, eight hundred forty".