129897285 has 48 divisors (see below), whose sum is σ = 249610752. Its totient is φ = 57456000.

The previous prime is 129897263. The next prime is 129897301. The reversal of 129897285 is 582798921.

It is not a de Polignac number, because 129897285 - 2⁵ = 129897253 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19935 + ... + 25635.

It is an arithmetic number, because the mean of its divisors is an integer number (5200224).

Almost surely, 2^129897285 is an apocalyptic number.

129897285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129897285 is a deficient number, since it is larger than the sum of its proper divisors (119713467).

129897285 is a wasteful number, since it uses less digits than its factorization.

129897285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5754 (or 5747 counting only the distinct ones).

The product of its digits is 725760, while the sum is 51.

The square root of 129897285 is about 11397.2490101779. The cubic root of 129897285 is about 506.4462479506.

The spelling of 129897285 in words is "one hundred twenty-nine million, eight hundred ninety-seven thousand, two hundred eighty-five".