123012839 has 2 divisors, whose sum is σ = 123012840. Its totient is φ = 123012838.

The previous prime is 123012787. The next prime is 123012847. The reversal of 123012839 is 938210321.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123012839 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123015839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61506419 + 61506420.

It is an arithmetic number, because the mean of its divisors is an integer number (61506420).

Almost surely, 2^123012839 is an apocalyptic number.

123012839 is a deficient number, since it is larger than the sum of its proper divisors (1).

123012839 is an equidigital number, since it uses as much as digits as its factorization.

123012839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 123012839 is about 11091.1153181274. The cubic root of 123012839 is about 497.3362864604.

The spelling of 123012839 in words is "one hundred twenty-three million, twelve thousand, eight hundred thirty-nine".