12978783 has 6 divisors (see below), whose sum is σ = 18747144. Its totient is φ = 8652516.

The previous prime is 12978773. The next prime is 12978809. The reversal of 12978783 is 38787921.

12978783 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12978783 - 2¹⁰ = 12977759 is a prime.

It is a super-2 number, since 2×12978783² = 336897616322178, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12978773) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 721035 + ... + 721052.

It is an arithmetic number, because the mean of its divisors is an integer number (3124524).

Almost surely, 2^12978783 is an apocalyptic number.

12978783 is a deficient number, since it is larger than the sum of its proper divisors (5768361).

12978783 is a wasteful number, since it uses less digits than its factorization.

12978783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1442093 (or 1442090 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 12978783 is about 3602.6078054654. The cubic root of 12978783 is about 235.0054804818.

The spelling of 12978783 in words is "twelve million, nine hundred seventy-eight thousand, seven hundred eighty-three".