129740279 has 4 divisors (see below), whose sum is σ = 130761984. Its totient is φ = 128718576.

The previous prime is 129740269. The next prime is 129740291. The reversal of 129740279 is 972047921.

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-129740279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129740249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 510662 + ... + 510915.

It is an arithmetic number, because the mean of its divisors is an integer number (32690496).

Almost surely, 2^129740279 is an apocalyptic number.

129740279 is a deficient number, since it is larger than the sum of its proper divisors (1021705).

129740279 is a wasteful number, since it uses less digits than its factorization.

129740279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021704.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 129740279 is about 11390.3590373614. The cubic root of 129740279 is about 506.2421195949.

The spelling of 129740279 in words is "one hundred twenty-nine million, seven hundred forty thousand, two hundred seventy-nine".