129381507 has 24 divisors (see below), whose sum is σ = 203074560. Its totient is φ = 79075440.

The previous prime is 129381503. The next prime is 129381517. The reversal of 129381507 is 705183921.

It is not a de Polignac number, because 129381507 - 2² = 129381503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129381503) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6903 + ... + 17504.

It is an arithmetic number, because the mean of its divisors is an integer number (8461440).

Almost surely, 2^129381507 is an apocalyptic number.

129381507 is a deficient number, since it is larger than the sum of its proper divisors (73693053).

129381507 is a wasteful number, since it uses less digits than its factorization.

129381507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24463 (or 24460 counting only the distinct ones).

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

The square root of 129381507 is about 11374.5992017301. The cubic root of 129381507 is about 505.7750501191.

The spelling of 129381507 in words is "one hundred twenty-nine million, three hundred eighty-one thousand, five hundred seven".