2800723 has 4 divisors (see below), whose sum is σ = 2818720. Its totient is φ = 2782728.

The previous prime is 2800709. The next prime is 2800729. The reversal of 2800723 is 3270082.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3270082 = 2 ⋅1635041.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2800723 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2800694 and 2800703.

It is not an unprimeable number, because it can be changed into a prime (2800729) 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, 8763 + ... + 9076.

It is an arithmetic number, because the mean of its divisors is an integer number (704680).

2^2800723 is an apocalyptic number.

2800723 is a deficient number, since it is larger than the sum of its proper divisors (17997).

2800723 is a wasteful number, since it uses less digits than its factorization.

2800723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17996.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 2800723 is about 1673.5360766951. The cubic root of 2800723 is about 140.9581050187.

The spelling of 2800723 in words is "two million, eight hundred thousand, seven hundred twenty-three".