12172783 has 4 divisors (see below), whose sum is σ = 13911760. Its totient is φ = 10433808.

The previous prime is 12172763. The next prime is 12172789. The reversal of 12172783 is 38727121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38727121 = 151 ⋅256471.

It is not a de Polignac number, because 12172783 - 2⁵ = 12172751 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 (12172789) 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, 869478 + ... + 869491.

It is an arithmetic number, because the mean of its divisors is an integer number (3477940).

Almost surely, 2^12172783 is an apocalyptic number.

12172783 is a deficient number, since it is larger than the sum of its proper divisors (1738977).

12172783 is an equidigital number, since it uses as much as digits as its factorization.

12172783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1738976.

The product of its digits is 4704, while the sum is 31.

The square root of 12172783 is about 3488.9515617159. The cubic root of 12172783 is about 230.0364340518.

The spelling of 12172783 in words is "twelve million, one hundred seventy-two thousand, seven hundred eighty-three".