129820455 has 16 divisors (see below), whose sum is σ = 230792160. Its totient is φ = 69237504.

The previous prime is 129820409. The next prime is 129820459. The reversal of 129820455 is 554028921.

129820455 is a `hidden beast` number, since 129 + 82 + 0 + 455 = 666.

It is not a de Polignac number, because 129820455 - 2¹¹ = 129818407 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129820459) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 480682 + ... + 480951.

It is an arithmetic number, because the mean of its divisors is an integer number (14424510).

Almost surely, 2^129820455 is an apocalyptic number.

129820455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129820455 is a deficient number, since it is larger than the sum of its proper divisors (100971705).

129820455 is an equidigital number, since it uses as much as digits as its factorization.

129820455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961647 (or 961641 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 129820455 is about 11393.8779614317. The cubic root of 129820455 is about 506.3463794554.

The spelling of 129820455 in words is "one hundred twenty-nine million, eight hundred twenty thousand, four hundred fifty-five".