129216774 has 16 divisors (see below), whose sum is σ = 260993520. Its totient is φ = 42645600.

The previous prime is 129216757. The next prime is 129216797. The reversal of 129216774 is 477612921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106009 + ... + 107220.

It is an arithmetic number, because the mean of its divisors is an integer number (16312095).

Almost surely, 2^129216774 is an apocalyptic number.

129216774 is an abundant number, since it is smaller than the sum of its proper divisors (131776746).

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

129216774 is a wasteful number, since it uses less digits than its factorization.

129216774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213335.

The product of its digits is 42336, while the sum is 39.

The square root of 129216774 is about 11367.3556291690. The cubic root of 129216774 is about 505.5603022020.

The spelling of 129216774 in words is "one hundred twenty-nine million, two hundred sixteen thousand, seven hundred seventy-four".