2106840 has 64 divisors (see below), whose sum is σ = 6420960. Its totient is φ = 552960.

The previous prime is 2106833. The next prime is 2106847. The reversal of 2106840 is 486012.

It is an interprime number because it is at equal distance from previous prime (2106833) and next prime (2106847).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2106847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11550 + ... + 11730.

2^2106840 is an apocalyptic number.

2106840 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 2106840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3210480).

2106840 is an abundant number, since it is smaller than the sum of its proper divisors (4314120).

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

2106840 is a wasteful number, since it uses less digits than its factorization.

2106840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 2106840 is about 1451.4957802212. The cubic root of 2106840 is about 128.1968001291.

The spelling of 2106840 in words is "two million, one hundred six thousand, eight hundred forty".