2780723 has 16 divisors (see below), whose sum is σ = 3283200. Its totient is φ = 2328480.

The previous prime is 2780719. The next prime is 2780753. The reversal of 2780723 is 3270872.

It is not a de Polignac number, because 2780723 - 2² = 2780719 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2780753) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7148 + ... + 7526.

It is an arithmetic number, because the mean of its divisors is an integer number (205200).

2^2780723 is an apocalyptic number.

2780723 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2780723 is a deficient number, since it is larger than the sum of its proper divisors (502477).

2780723 is a wasteful number, since it uses less digits than its factorization.

2780723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 2780723 is about 1667.5499992504. The cubic root of 2780723 is about 140.6217752676.

The spelling of 2780723 in words is "two million, seven hundred eighty thousand, seven hundred twenty-three".