129850 has 36 divisors (see below), whose sum is σ = 286254. Its totient is φ = 43680.

The previous prime is 129841. The next prime is 129853. The reversal of 129850 is 58921.

It can be written as a sum of positive squares in 3 ways, for example, as 108241 + 21609 = 329^2 + 147^2 .

It is a super-2 number, since 2×129850² = 33722045000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (129853) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2424 + ... + 2476.

2¹²⁹⁸⁵⁰ is an apocalyptic number.

129850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129850 is an abundant number, since it is smaller than the sum of its proper divisors (156404).

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

129850 is a wasteful number, since it uses less digits than its factorization.

129850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 129850 is about 360.3470549345. The cubic root of 129850 is about 50.6384788577.

It can be divided in two parts, 129 and 850, that added together give a palindrome (979).

The spelling of 129850 in words is "one hundred twenty-nine thousand, eight hundred fifty".