123729647 has 2 divisors, whose sum is σ = 123729648. Its totient is φ = 123729646.

The previous prime is 123729629. The next prime is 123729679. The reversal of 123729647 is 746927321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123729647 - 2⁸ = 123729391 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 (123729607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61864823 + 61864824.

It is an arithmetic number, because the mean of its divisors is an integer number (61864824).

Almost surely, 2^123729647 is an apocalyptic number.

123729647 is a deficient number, since it is larger than the sum of its proper divisors (1).

123729647 is an equidigital number, since it uses as much as digits as its factorization.

123729647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 41.

The square root of 123729647 is about 11123.3828937064. The cubic root of 123729647 is about 498.3004254384.

The spelling of 123729647 in words is "one hundred twenty-three million, seven hundred twenty-nine thousand, six hundred forty-seven".