129820475 has 6 divisors (see below), whose sum is σ = 160977420. Its totient is φ = 103856360.

The previous prime is 129820469. The next prime is 129820477. The reversal of 129820475 is 574028921.

It is not a de Polignac number, because 129820475 - 2⁴ = 129820459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129820477) 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 5 ways as a sum of consecutive naturals, for example, 2596385 + ... + 2596434.

It is an arithmetic number, because the mean of its divisors is an integer number (26829570).

Almost surely, 2^129820475 is an apocalyptic number.

129820475 is a deficient number, since it is larger than the sum of its proper divisors (31156945).

129820475 is an equidigital number, since it uses as much as digits as its factorization.

129820475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5192829 (or 5192824 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 129820475 is about 11393.8788390960. The cubic root of 129820475 is about 506.3464054578.

The spelling of 129820475 in words is "one hundred twenty-nine million, eight hundred twenty thousand, four hundred seventy-five".