129779124 has 12 divisors (see below), whose sum is σ = 302817984. Its totient is φ = 43259704.

The previous prime is 129779119. The next prime is 129779129. The reversal of 129779124 is 421977921.

It is an interprime number because it is at equal distance from previous prime (129779119) and next prime (129779129).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129779129) 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, 5407452 + ... + 5407475.

It is an arithmetic number, because the mean of its divisors is an integer number (25234832).

Almost surely, 2^129779124 is an apocalyptic number.

It is an amenable number.

129779124 is an abundant number, since it is smaller than the sum of its proper divisors (173038860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129779124 is a wasteful number, since it uses less digits than its factorization.

129779124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10814934 (or 10814932 counting only the distinct ones).

The product of its digits is 63504, while the sum is 42.

The square root of 129779124 is about 11392.0640798760. The cubic root of 129779124 is about 506.2926385059.

The spelling of 129779124 in words is "one hundred twenty-nine million, seven hundred seventy-nine thousand, one hundred twenty-four".