2155783 has 4 divisors (see below), whose sum is σ = 2463760. Its totient is φ = 1847808.

The previous prime is 2155781. The next prime is 2155793. The reversal of 2155783 is 3875512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2155783 - 2¹ = 2155781 is a prime.

It is a Duffinian number.

2155783 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153978 + ... + 153991.

It is an arithmetic number, because the mean of its divisors is an integer number (615940).

2^2155783 is an apocalyptic number.

2155783 is a deficient number, since it is larger than the sum of its proper divisors (307977).

2155783 is an equidigital number, since it uses as much as digits as its factorization.

2155783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307976.

The product of its digits is 8400, while the sum is 31.

The square root of 2155783 is about 1468.2584922281. The cubic root of 2155783 is about 129.1819039025.

The spelling of 2155783 in words is "two million, one hundred fifty-five thousand, seven hundred eighty-three".