129816972 has 24 divisors (see below), whose sum is σ = 336562800. Its totient is φ = 43272288.

The previous prime is 129816971. The next prime is 129817003. The reversal of 129816972 is 279618921.

It is not an unprimeable number, because it can be changed into a prime (129816971) 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, 600897 + ... + 601112.

It is an arithmetic number, because the mean of its divisors is an integer number (14023450).

Almost surely, 2^129816972 is an apocalyptic number.

129816972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129816972 is an abundant number, since it is smaller than the sum of its proper divisors (206745828).

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

129816972 is a wasteful number, since it uses less digits than its factorization.

129816972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202022 (or 1202014 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 129816972 is about 11393.7251151676. The cubic root of 129816972 is about 506.3418510981.

The spelling of 129816972 in words is "one hundred twenty-nine million, eight hundred sixteen thousand, nine hundred seventy-two".