2155623 has 4 divisors (see below), whose sum is σ = 2874168. Its totient is φ = 1437080.

The previous prime is 2155613. The next prime is 2155627. The reversal of 2155623 is 3265512.

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 2155623 - 2¹⁷ = 2024551 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 2155593 and 2155602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155627) 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, 359268 + ... + 359273.

It is an arithmetic number, because the mean of its divisors is an integer number (718542).

2^2155623 is an apocalyptic number.

2155623 is a deficient number, since it is larger than the sum of its proper divisors (718545).

2155623 is an equidigital number, since it uses as much as digits as its factorization.

2155623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718544.

The product of its digits is 1800, while the sum is 24.

The square root of 2155623 is about 1468.2040048985. The cubic root of 2155623 is about 129.1787079074.

The spelling of 2155623 in words is "two million, one hundred fifty-five thousand, six hundred twenty-three".