2156782 has 8 divisors (see below), whose sum is σ = 3296376. Its totient is φ = 1057992.

The previous prime is 2156761. The next prime is 2156789. The reversal of 2156782 is 2876512.

2156782 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10068 + ... + 10279.

It is an arithmetic number, because the mean of its divisors is an integer number (412047).

2^2156782 is an apocalyptic number.

2156782 is a deficient number, since it is larger than the sum of its proper divisors (1139594).

2156782 is a wasteful number, since it uses less digits than its factorization.

2156782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20402.

The product of its digits is 6720, while the sum is 31.

The square root of 2156782 is about 1468.5986517766. The cubic root of 2156782 is about 129.2018553220.

The spelling of 2156782 in words is "two million, one hundred fifty-six thousand, seven hundred eighty-two".