129823236 has 63 divisors (see below), whose sum is σ = 342252183. Its totient is φ = 43069320.

The previous prime is 129823231. The next prime is 129823277. The reversal of 129823236 is 632328921.

The square root of 129823236 is 11394.

It is a perfect power (a square), and thus also a powerful number.

It is a Harshad number since it is a multiple of its sum of digits (36).

Its product of digits (31104) is a multiple of the sum of its prime divisors (216).

It is a self number, because there is not a number n which added to its sum of digits gives 129823236.

It is not an unprimeable number, because it can be changed into a prime (129823231) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 615171 + ... + 615381.

Almost surely, 2^129823236 is an apocalyptic number.

129823236 is the 11394-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129823236

129823236 is an abundant number, since it is smaller than the sum of its proper divisors (212428947).

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

129823236 is an frugal number, since it uses more digits than its factorization.

129823236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444 (or 216 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The cubic root of 129823236 is about 506.3499950624.

Multiplying 129823236 by its sum of digits (36), we get a square (4673636496 = 68364²).

129823236 divided by its sum of digits (36) gives a square (3606201 = 1899²).

The spelling of 129823236 in words is "one hundred twenty-nine million, eight hundred twenty-three thousand, two hundred thirty-six".