123439829 has 2 divisors, whose sum is σ = 123439830. Its totient is φ = 123439828.

The previous prime is 123439793. The next prime is 123439847. The reversal of 123439829 is 928934321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112317604 + 11122225 = 10598^2 + 3335^2 .

It is a cyclic number.

It is not a de Polignac number, because 123439829 - 2²⁰ = 122391253 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123439879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61719914 + 61719915.

It is an arithmetic number, because the mean of its divisors is an integer number (61719915).

Almost surely, 2^123439829 is an apocalyptic number.

It is an amenable number.

123439829 is a deficient number, since it is larger than the sum of its proper divisors (1).

123439829 is an equidigital number, since it uses as much as digits as its factorization.

123439829 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 41.

The square root of 123439829 is about 11110.3478343389. The cubic root of 123439829 is about 497.9110567865.

The spelling of 123439829 in words is "one hundred twenty-three million, four hundred thirty-nine thousand, eight hundred twenty-nine".