129991452 has 48 divisors (see below), whose sum is σ = 321979392. Its totient is φ = 40677120.

The previous prime is 129991441. The next prime is 129991453. The reversal of 129991452 is 254199921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129991453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130677 + ... + 131667.

It is an arithmetic number, because the mean of its divisors is an integer number (6707904).

Almost surely, 2^129991452 is an apocalyptic number.

129991452 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129991452 is an abundant number, since it is smaller than the sum of its proper divisors (191987940).

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

129991452 is a wasteful number, since it uses less digits than its factorization.

129991452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1658 (or 1656 counting only the distinct ones).

The product of its digits is 58320, while the sum is 42.

The square root of 129991452 is about 11401.3793902317. The cubic root of 129991452 is about 506.5685984788.

The spelling of 129991452 in words is "one hundred twenty-nine million, nine hundred ninety-one thousand, four hundred fifty-two".