129691456 has 56 divisors (see below), whose sum is σ = 264078720. Its totient is φ = 63178752.

The previous prime is 129691447. The next prime is 129691459. The reversal of 129691456 is 654196921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129691459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 571215 + ... + 571441.

Almost surely, 2^129691456 is an apocalyptic number.

129691456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129691456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132039360).

129691456 is an abundant number, since it is smaller than the sum of its proper divisors (134387264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129691456 is a wasteful number, since it uses less digits than its factorization.

129691456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431 (or 421 counting only the distinct ones).

The product of its digits is 116640, while the sum is 43.

The square root of 129691456 is about 11388.2156635708. The cubic root of 129691456 is about 506.1786097371.

The spelling of 129691456 in words is "one hundred twenty-nine million, six hundred ninety-one thousand, four hundred fifty-six".