123145679 has 4 divisors (see below), whose sum is σ = 126009576. Its totient is φ = 120281784.

The previous prime is 123145661. The next prime is 123145681. The reversal of 123145679 is 976541321.

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 123145679 - 2²⁰ = 122097103 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 (123145639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1431884 + ... + 1431969.

It is an arithmetic number, because the mean of its divisors is an integer number (31502394).

Almost surely, 2^123145679 is an apocalyptic number.

123145679 is a deficient number, since it is larger than the sum of its proper divisors (2863897).

123145679 is an equidigital number, since it uses as much as digits as its factorization.

123145679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2863896.

The product of its digits is 45360, while the sum is 38.

The square root of 123145679 is about 11097.1022794241. The cubic root of 123145679 is about 497.5152444341.

The spelling of 123145679 in words is "one hundred twenty-three million, one hundred forty-five thousand, six hundred seventy-nine".