2780173 has 12 divisors (see below), whose sum is σ = 3145824. Its totient is φ = 2436600.

The previous prime is 2780161. The next prime is 2780177. The reversal of 2780173 is 3710872.

It is a happy number.

It is not a de Polignac number, because 2780173 - 2²¹ = 683021 is a prime.

2780173 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2780177) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10440 + ... + 10702.

It is an arithmetic number, because the mean of its divisors is an integer number (262152).

2^2780173 is an apocalyptic number.

It is an amenable number.

2780173 is a deficient number, since it is larger than the sum of its proper divisors (365651).

2780173 is a wasteful number, since it uses less digits than its factorization.

2780173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336 (or 305 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 2780173 is about 1667.3850784987. The cubic root of 2780173 is about 140.6125034492.

It can be divided in two parts, 27 and 80173, that added together give a triangular number (80200 = T₄₀₀).

The spelling of 2780173 in words is "two million, seven hundred eighty thousand, one hundred seventy-three".