129073679 has 4 divisors (see below), whose sum is σ = 147512784. Its totient is φ = 110634576.

The previous prime is 129073613. The next prime is 129073687. The reversal of 129073679 is 976370921.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129073679 is a prime.

It is a super-2 number, since 2×129073679² = 33320029221190082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129070679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9219542 + ... + 9219555.

It is an arithmetic number, because the mean of its divisors is an integer number (36878196).

Almost surely, 2^129073679 is an apocalyptic number.

129073679 is a deficient number, since it is larger than the sum of its proper divisors (18439105).

129073679 is an equidigital number, since it uses as much as digits as its factorization.

129073679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18439104.

The product of its (nonzero) digits is 142884, while the sum is 44.

The square root of 129073679 is about 11361.0597657085. The cubic root of 129073679 is about 505.3736136631.

The spelling of 129073679 in words is "one hundred twenty-nine million, seventy-three thousand, six hundred seventy-nine".