129803776 has 40 divisors (see below), whose sum is σ = 263811240. Its totient is φ = 63787008.

The previous prime is 129803771. The next prime is 129803809. The reversal of 129803776 is 677308921.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129803771) 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, 28060 + ... + 32356.

It is an arithmetic number, because the mean of its divisors is an integer number (6595281).

Almost surely, 2^129803776 is an apocalyptic number.

129803776 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 129803776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131905620).

129803776 is an abundant number, since it is smaller than the sum of its proper divisors (134007464).

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

129803776 is an frugal number, since it uses more digits than its factorization.

129803776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4374 (or 4358 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 129803776 is about 11393.1460097727. The cubic root of 129803776 is about 506.3246938308.

The spelling of 129803776 in words is "one hundred twenty-nine million, eight hundred three thousand, seven hundred seventy-six".