129400687 has 4 divisors (see below), whose sum is σ = 139354600. Its totient is φ = 119446776.

The previous prime is 129400679. The next prime is 129400693. The reversal of 129400687 is 786004921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129400687 - 2³ = 129400679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129400627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4976937 + ... + 4976962.

It is an arithmetic number, because the mean of its divisors is an integer number (34838650).

Almost surely, 2^129400687 is an apocalyptic number.

129400687 is a deficient number, since it is larger than the sum of its proper divisors (9953913).

129400687 is an equidigital number, since it uses as much as digits as its factorization.

129400687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9953912.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 129400687 is about 11375.4422771161. The cubic root of 129400687 is about 505.8000415478.

The spelling of 129400687 in words is "one hundred twenty-nine million, four hundred thousand, six hundred eighty-seven".