123769409 has 2 divisors, whose sum is σ = 123769410. Its totient is φ = 123769408.

The previous prime is 123769397. The next prime is 123769423. The reversal of 123769409 is 904967321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71351809 + 52417600 = 8447^2 + 7240^2 .

It is a cyclic number.

It is not a de Polignac number, because 123769409 - 2¹⁶ = 123703873 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123769109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61884704 + 61884705.

It is an arithmetic number, because the mean of its divisors is an integer number (61884705).

Almost surely, 2^123769409 is an apocalyptic number.

It is an amenable number.

123769409 is a deficient number, since it is larger than the sum of its proper divisors (1).

123769409 is an equidigital number, since it uses as much as digits as its factorization.

123769409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 123769409 is about 11125.1700661158. The cubic root of 123769409 is about 498.3537979861.

The spelling of 123769409 in words is "one hundred twenty-three million, seven hundred sixty-nine thousand, four hundred nine".