12780623 has 4 divisors (see below), whose sum is σ = 12912480. Its totient is φ = 12648768.

The previous prime is 12780613. The next prime is 12780629. The reversal of 12780623 is 32608721.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12780623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12780629) 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, 65783 + ... + 65976.

It is an arithmetic number, because the mean of its divisors is an integer number (3228120).

Almost surely, 2^12780623 is an apocalyptic number.

12780623 is a deficient number, since it is larger than the sum of its proper divisors (131857).

12780623 is an equidigital number, since it uses as much as digits as its factorization.

12780623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131856.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 12780623 is about 3574.9997202797. Note that the first 3 decimals coincide. The cubic root of 12780623 is about 233.8033205023.

The spelling of 12780623 in words is "twelve million, seven hundred eighty thousand, six hundred twenty-three".