123139739 has 2 divisors, whose sum is σ = 123139740. Its totient is φ = 123139738.

The previous prime is 123139733. The next prime is 123139787. The reversal of 123139739 is 937931321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123139739 - 2²⁰ = 122091163 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123139733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61569869 + 61569870.

It is an arithmetic number, because the mean of its divisors is an integer number (61569870).

Almost surely, 2^123139739 is an apocalyptic number.

123139739 is a deficient number, since it is larger than the sum of its proper divisors (1).

123139739 is an equidigital number, since it uses as much as digits as its factorization.

123139739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30618, while the sum is 38.

The square root of 123139739 is about 11096.8346387607. The cubic root of 123139739 is about 497.5072449977.

The spelling of 123139739 in words is "one hundred twenty-three million, one hundred thirty-nine thousand, seven hundred thirty-nine".