1223708785379 has 4 divisors (see below), whose sum is σ = 1223711784576. Its totient is φ = 1223705786184.

The previous prime is 1223708785373. The next prime is 1223708785391. The reversal of 1223708785379 is 9735878073221.

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 1223708785379 - 2²⁰ = 1223707736803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1223708785373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 768899 + ... + 1743164.

It is an arithmetic number, because the mean of its divisors is an integer number (305927946144).

Almost surely, 2^{1223708785379} is an apocalyptic number.

1223708785379 is a deficient number, since it is larger than the sum of its proper divisors (2999197).

1223708785379 is an equidigital number, since it uses as much as digits as its factorization.

1223708785379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2999196.

The product of its (nonzero) digits is 35562240, while the sum is 62.

The spelling of 1223708785379 in words is "one trillion, two hundred twenty-three billion, seven hundred eight million, seven hundred eighty-five thousand, three hundred seventy-nine".