129779023 has 8 divisors (see below), whose sum is σ = 141693696. Its totient is φ = 117883800.

The previous prime is 129779011. The next prime is 129779029. The reversal of 129779023 is 320977921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129779023 - 2²¹ = 127681871 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 (129779029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11508 + ... + 19798.

It is an arithmetic number, because the mean of its divisors is an integer number (17711712).

Almost surely, 2^129779023 is an apocalyptic number.

129779023 is a deficient number, since it is larger than the sum of its proper divisors (11914673).

129779023 is a wasteful number, since it uses less digits than its factorization.

129779023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9725.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 129779023 is about 11392.0596469646. The cubic root of 129779023 is about 506.2925071659.

The spelling of 129779023 in words is "one hundred twenty-nine million, seven hundred seventy-nine thousand, twenty-three".