2078155 has 4 divisors (see below), whose sum is σ = 2493792. Its totient is φ = 1662520.

The previous prime is 2078149. The next prime is 2078159. The reversal of 2078155 is 5518702.

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

It is not a de Polignac number, because 2078155 - 2⁵ = 2078123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2078159) 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, 207811 + ... + 207820.

It is an arithmetic number, because the mean of its divisors is an integer number (623448).

2^2078155 is an apocalyptic number.

2078155 is a deficient number, since it is larger than the sum of its proper divisors (415637).

2078155 is an equidigital number, since it uses as much as digits as its factorization.

2078155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415636.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 2078155 is about 1441.5807296159. The cubic root of 2078155 is about 127.6123321185.

The spelling of 2078155 in words is "two million, seventy-eight thousand, one hundred fifty-five".