129273966 has 12 divisors (see below), whose sum is σ = 280093632. Its totient is φ = 43091316.

The previous prime is 129273931. The next prime is 129273971. The reversal of 129273966 is 669372921.

It is a happy number.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3590926 + ... + 3590961.

It is an arithmetic number, because the mean of its divisors is an integer number (23341136).

Almost surely, 2^129273966 is an apocalyptic number.

129273966 is an abundant number, since it is smaller than the sum of its proper divisors (150819666).

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

129273966 is a wasteful number, since it uses less digits than its factorization.

129273966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7181895 (or 7181892 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 129273966 is about 11369.8709755212. The cubic root of 129273966 is about 505.6348790523.

The spelling of 129273966 in words is "one hundred twenty-nine million, two hundred seventy-three thousand, nine hundred sixty-six".