129213144 has 40 divisors (see below), whose sum is σ = 361918260. Its totient is φ = 43070832.

The previous prime is 129213143. The next prime is 129213169. The reversal of 129213144 is 441312921.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129213143) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 99054 + ... + 100349.

Almost surely, 2^129213144 is an apocalyptic number.

It is an amenable number.

129213144 is an abundant number, since it is smaller than the sum of its proper divisors (232705116).

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

129213144 is a wasteful number, since it uses less digits than its factorization.

129213144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199421 (or 199408 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 129213144 is about 11367.1959603061. The cubic root of 129213144 is about 505.5555680357. Note that the first 4 decimals are identical.

The spelling of 129213144 in words is "one hundred twenty-nine million, two hundred thirteen thousand, one hundred forty-four".