2780023 has 4 divisors (see below), whose sum is σ = 2926360. Its totient is φ = 2633688.

The previous prime is 2779991. The next prime is 2780039. The reversal of 2780023 is 3200872.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2780023 - 2⁵ = 2779991 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2779976 and 2780003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2780053) 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, 73140 + ... + 73177.

It is an arithmetic number, because the mean of its divisors is an integer number (731590).

2^2780023 is an apocalyptic number.

2780023 is a deficient number, since it is larger than the sum of its proper divisors (146337).

2780023 is a wasteful number, since it uses less digits than its factorization.

2780023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146336.

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

The square root of 2780023 is about 1667.3400972807. The cubic root of 2780023 is about 140.6099745592.

Adding to 2780023 its reverse (3200872), we get a palindrome (5980895).

The spelling of 2780023 in words is "two million, seven hundred eighty thousand, twenty-three".