123430705 has 16 divisors (see below), whose sum is σ = 155839824. Its totient is φ = 93726720.

The previous prime is 123430679. The next prime is 123430709. The reversal of 123430705 is 507034321.

It can be written as a sum of positive squares in 8 ways, for example, as 3659569 + 119771136 = 1913^2 + 10944^2 .

It is not a de Polignac number, because 123430705 - 2¹⁷ = 123299633 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123430705.

It is not an unprimeable number, because it can be changed into a prime (123430709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 552 + ... + 15721.

It is an arithmetic number, because the mean of its divisors is an integer number (9739989).

Almost surely, 2^123430705 is an apocalyptic number.

It is an amenable number.

123430705 is a deficient number, since it is larger than the sum of its proper divisors (32409119).

123430705 is a wasteful number, since it uses less digits than its factorization.

123430705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16356.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 123430705 is about 11109.9372185445. The cubic root of 123430705 is about 497.8987888595.

The spelling of 123430705 in words is "one hundred twenty-three million, four hundred thirty thousand, seven hundred five".