123400056779 has 4 divisors (see below), whose sum is σ = 123438779784. Its totient is φ = 123361333776.

The previous prime is 123400056763. The next prime is 123400056823. The reversal of 123400056779 is 977650004321.

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 123400056779 - 2⁴ = 123400056763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123400050779) 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, 19356722 + ... + 19363095.

It is an arithmetic number, because the mean of its divisors is an integer number (30859694946).

Almost surely, 2^123400056779 is an apocalyptic number.

123400056779 is a deficient number, since it is larger than the sum of its proper divisors (38723005).

123400056779 is an equidigital number, since it uses as much as digits as its factorization.

123400056779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38723004.

The product of its (nonzero) digits is 317520, while the sum is 44.

The spelling of 123400056779 in words is "one hundred twenty-three billion, four hundred million, fifty-six thousand, seven hundred seventy-nine".