129381237 has 24 divisors (see below), whose sum is σ = 198334656. Its totient is φ = 80992896.

The previous prime is 129381211. The next prime is 129381269. The reversal of 129381237 is 732183921.

It is not a de Polignac number, because 129381237 - 2¹⁰ = 129380213 is a prime.

It is a super-3 number, since 3×129381237³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129381137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 98338 + ... + 99644.

It is an arithmetic number, because the mean of its divisors is an integer number (8263944).

Almost surely, 2^129381237 is an apocalyptic number.

129381237 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

129381237 is a deficient number, since it is larger than the sum of its proper divisors (68953419).

129381237 is a wasteful number, since it uses less digits than its factorization.

129381237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1977 (or 1974 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 129381237 is about 11374.5873331739. The cubic root of 129381237 is about 505.7746982930.

The spelling of 129381237 in words is "one hundred twenty-nine million, three hundred eighty-one thousand, two hundred thirty-seven".