129820739 has 2 divisors, whose sum is σ = 129820740. Its totient is φ = 129820738.

The previous prime is 129820729. The next prime is 129820771. The reversal of 129820739 is 937028921.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (937028921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129820739 is a prime.

It is a super-2 number, since 2×129820739² = 33706848549012242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 129820696 and 129820705.

It is not a weakly prime, because it can be changed into another prime (129820729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64910369 + 64910370.

It is an arithmetic number, because the mean of its divisors is an integer number (64910370).

Almost surely, 2^129820739 is an apocalyptic number.

129820739 is a deficient number, since it is larger than the sum of its proper divisors (1).

129820739 is an equidigital number, since it uses as much as digits as its factorization.

129820739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 129820739 is about 11393.8904242581. The cubic root of 129820739 is about 506.3467486891.

The spelling of 129820739 in words is "one hundred twenty-nine million, eight hundred twenty thousand, seven hundred thirty-nine".