129872 has 10 divisors (see below), whose sum is σ = 251658. Its totient is φ = 64928.

The previous prime is 129853. The next prime is 129887. The reversal of 129872 is 278921.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 126736 + 3136 = 356^2 + 56^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4043 + ... + 4074.

2¹²⁹⁸⁷² is an apocalyptic number.

It is an amenable number.

129872 is a deficient number, since it is larger than the sum of its proper divisors (121786).

129872 is an equidigital number, since it uses as much as digits as its factorization.

129872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8125 (or 8119 counting only the distinct ones).

The product of its digits is 2016, while the sum is 29.

The square root of 129872 is about 360.3775797688. The cubic root of 129872 is about 50.6413385256.

It can be divided in two parts, 129 and 872, that added together give a palindrome (1001).

The spelling of 129872 in words is "one hundred twenty-nine thousand, eight hundred seventy-two".