2156779 has 8 divisors (see below), whose sum is σ = 2280960. Its totient is φ = 2035176.

The previous prime is 2156761. The next prime is 2156789. The reversal of 2156779 is 9776512.

2156779 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 cyclic number.

It is not a de Polignac number, because 2156779 - 2¹¹ = 2154731 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156719) 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 7 ways as a sum of consecutive naturals, for example, 1224 + ... + 2410.

It is an arithmetic number, because the mean of its divisors is an integer number (285120).

2^2156779 is an apocalyptic number.

2156779 is a deficient number, since it is larger than the sum of its proper divisors (124181).

2156779 is a wasteful number, since it uses less digits than its factorization.

2156779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1289.

The product of its digits is 26460, while the sum is 37.

The square root of 2156779 is about 1468.5976303944. The cubic root of 2156779 is about 129.2017954170.

The spelling of 2156779 in words is "two million, one hundred fifty-six thousand, seven hundred seventy-nine".