123409984769 has 4 divisors (see below), whose sum is σ = 123411094020. Its totient is φ = 123408875520.

The previous prime is 123409984727. The next prime is 123409984777. The reversal of 123409984769 is 967489904321.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 67139028544 + 56270956225 = 259112^2 + 237215^2 .

It is a cyclic number.

It is not a de Polignac number, because 123409984769 - 2²⁰ = 123408936193 is a prime.

It is a super-2 number, since 2×123409984769² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123402984769) 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, 366464 + ... + 617345.

It is an arithmetic number, because the mean of its divisors is an integer number (30852773505).

Almost surely, 2^123409984769 is an apocalyptic number.

It is an amenable number.

123409984769 is a deficient number, since it is larger than the sum of its proper divisors (1109251).

123409984769 is an equidigital number, since it uses as much as digits as its factorization.

123409984769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109250.

The product of its (nonzero) digits is 23514624, while the sum is 62.

The spelling of 123409984769 in words is "one hundred twenty-three billion, four hundred nine million, nine hundred eighty-four thousand, seven hundred sixty-nine".