129750381 has 12 divisors (see below), whose sum is σ = 190594560. Its totient is φ = 85033800.

The previous prime is 129750377. The next prime is 129750389. The reversal of 129750381 is 183057921.

It is not a de Polignac number, because 129750381 - 2² = 129750377 is a prime.

It is a super-2 number, since 2×129750381² = 33670322739290322, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129750389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121645 + ... + 122706.

It is an arithmetic number, because the mean of its divisors is an integer number (15882880).

Almost surely, 2^129750381 is an apocalyptic number.

It is an amenable number.

129750381 is a deficient number, since it is larger than the sum of its proper divisors (60844179).

129750381 is a wasteful number, since it uses less digits than its factorization.

129750381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244416 (or 244413 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 129750381 is about 11390.8024739261. The cubic root of 129750381 is about 506.2552584730.

The spelling of 129750381 in words is "one hundred twenty-nine million, seven hundred fifty thousand, three hundred eighty-one".