129947670 has 48 divisors (see below), whose sum is σ = 340554240. Its totient is φ = 34376832.

The previous prime is 129947641. The next prime is 129947689. The reversal of 129947670 is 76749921.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5746 + ... + 17114.

It is an arithmetic number, because the mean of its divisors is an integer number (7094880).

Almost surely, 2^129947670 is an apocalyptic number.

129947670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 129947670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170277120).

129947670 is an abundant number, since it is smaller than the sum of its proper divisors (210606570).

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

129947670 is a wasteful number, since it uses less digits than its factorization.

129947670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11509 (or 11506 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 129947670 is about 11399.4591976988. The cubic root of 129947670 is about 506.5117201829.

The spelling of 129947670 in words is "one hundred twenty-nine million, nine hundred forty-seven thousand, six hundred seventy".