12783819 has 4 divisors (see below), whose sum is σ = 17045096. Its totient is φ = 8522544.

The previous prime is 12783817. The next prime is 12783839. The reversal of 12783819 is 91838721.

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

It is not a de Polignac number, because 12783819 - 2¹ = 12783817 is a prime.

It is a super-2 number, since 2×12783819² = 326852056449522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12783817) 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, 2130634 + ... + 2130639.

It is an arithmetic number, because the mean of its divisors is an integer number (4261274).

Almost surely, 2^12783819 is an apocalyptic number.

12783819 is a deficient number, since it is larger than the sum of its proper divisors (4261277).

12783819 is an equidigital number, since it uses as much as digits as its factorization.

12783819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4261276.

The product of its digits is 24192, while the sum is 39.

The square root of 12783819 is about 3575.4466853807. The cubic root of 12783819 is about 233.8228076362.

The spelling of 12783819 in words is "twelve million, seven hundred eighty-three thousand, eight hundred nineteen".