123823639 has 2 divisors, whose sum is σ = 123823640. Its totient is φ = 123823638.

The previous prime is 123823577. The next prime is 123823643. The reversal of 123823639 is 936328321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123823639 - 2²¹ = 121726487 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123823598 and 123823607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123823039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61911819 + 61911820.

It is an arithmetic number, because the mean of its divisors is an integer number (61911820).

Almost surely, 2^123823639 is an apocalyptic number.

123823639 is a deficient number, since it is larger than the sum of its proper divisors (1).

123823639 is an equidigital number, since it uses as much as digits as its factorization.

123823639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 37.

The square root of 123823639 is about 11127.6070653128. The cubic root of 123823639 is about 498.4265725123.

The spelling of 123823639 in words is "one hundred twenty-three million, eight hundred twenty-three thousand, six hundred thirty-nine".