2136780 has 60 divisors (see below), whose sum is σ = 6708240. Its totient is φ = 569376.

The previous prime is 2136779. The next prime is 2136793. The reversal of 2136780 is 876312.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 961 + ... + 2279.

It is an arithmetic number, because the mean of its divisors is an integer number (111804).

2^2136780 is an apocalyptic number.

2136780 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 2136780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3354120).

2136780 is an abundant number, since it is smaller than the sum of its proper divisors (4571460).

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

2136780 is a wasteful number, since it uses less digits than its factorization.

2136780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340 (or 1329 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 2136780 is about 1461.7728961778. The cubic root of 2136780 is about 128.8012081468.

It can be divided in two parts, 2136 and 780, that added together give a square (2916 = 54²).

The spelling of 2136780 in words is "two million, one hundred thirty-six thousand, seven hundred eighty".