129612 has 24 divisors (see below), whose sum is σ = 345856. Its totient is φ = 37008.

The previous prime is 129607. The next prime is 129629. The reversal of 129612 is 216921.

It is a Harshad number since it is a multiple of its sum of digits (21).

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

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, 688 + ... + 855.

2¹²⁹⁶¹² is an apocalyptic number.

129612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129612 is an abundant number, since it is smaller than the sum of its proper divisors (216244).

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

129612 is a wasteful number, since it uses less digits than its factorization.

129612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557 (or 1555 counting only the distinct ones).

The product of its digits is 216, while the sum is 21.

The square root of 129612 is about 360.0166662809. The cubic root of 129612 is about 50.6075217822.

It can be divided in two parts, 129 and 612, that added together give a triangular number (741 = T₃₈).

The spelling of 129612 in words is "one hundred twenty-nine thousand, six hundred twelve".