129896407 has 4 divisors (see below), whose sum is σ = 136733080. Its totient is φ = 123059736.

The previous prime is 129896399. The next prime is 129896443. The reversal of 129896407 is 704698921.

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 129896407 - 2³ = 129896399 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 (129896447) 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 3 ways as a sum of consecutive naturals, for example, 3418308 + ... + 3418345.

It is an arithmetic number, because the mean of its divisors is an integer number (34183270).

Almost surely, 2^129896407 is an apocalyptic number.

129896407 is a deficient number, since it is larger than the sum of its proper divisors (6836673).

129896407 is an equidigital number, since it uses as much as digits as its factorization.

129896407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6836672.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 129896407 is about 11397.2104920458. The cubic root of 129896407 is about 506.4451068931.

The spelling of 129896407 in words is "one hundred twenty-nine million, eight hundred ninety-six thousand, four hundred seven".