2155679 has 4 divisors (see below), whose sum is σ = 2191080. Its totient is φ = 2120280.

The previous prime is 2155667. The next prime is 2155691. The reversal of 2155679 is 9765512.

2155679 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (2155667) and next prime (2155691).

It is a cyclic number.

It is not a de Polignac number, because 2155679 - 2⁸ = 2155423 is a prime.

It is a d-powerful number, because it can be written as 2 + 1 + 5⁷ + 5⁹ + 6³ + 7⁶ + 9⁴ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155609) 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, 17609 + ... + 17730.

It is an arithmetic number, because the mean of its divisors is an integer number (547770).

2^2155679 is an apocalyptic number.

2155679 is a deficient number, since it is larger than the sum of its proper divisors (35401).

2155679 is an equidigital number, since it uses as much as digits as its factorization.

2155679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35400.

The product of its digits is 18900, while the sum is 35.

The square root of 2155679 is about 1468.2230756939. The cubic root of 2155679 is about 129.1798265237.

The spelling of 2155679 in words is "two million, one hundred fifty-five thousand, six hundred seventy-nine".