129972219 has 16 divisors (see below), whose sum is σ = 187233312. Its totient is φ = 79723008.

The previous prime is 129972211. The next prime is 129972239. The reversal of 129972219 is 912279921.

It is not a de Polignac number, because 129972219 - 2³ = 129972211 is a prime.

It is a super-2 number, since 2×129972219² = 33785555423567922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129972211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7107 + ... + 17619.

It is an arithmetic number, because the mean of its divisors is an integer number (11702082).

Almost surely, 2^129972219 is an apocalyptic number.

129972219 is a deficient number, since it is larger than the sum of its proper divisors (57261093).

129972219 is a wasteful number, since it uses less digits than its factorization.

129972219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10846.

The product of its digits is 40824, while the sum is 42.

The square root of 129972219 is about 11400.5359084562. The cubic root of 129972219 is about 506.5436139785.

The spelling of 129972219 in words is "one hundred twenty-nine million, nine hundred seventy-two thousand, two hundred nineteen".