129285733 has 4 divisors (see below), whose sum is σ = 132779980. Its totient is φ = 125791488.

The previous prime is 129285719. The next prime is 129285743. The reversal of 129285733 is 337582921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 79977249 + 49308484 = 8943^2 + 7022^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129285733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129285713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1747068 + ... + 1747141.

It is an arithmetic number, because the mean of its divisors is an integer number (33194995).

Almost surely, 2^129285733 is an apocalyptic number.

It is an amenable number.

129285733 is a deficient number, since it is larger than the sum of its proper divisors (3494247).

129285733 is an equidigital number, since it uses as much as digits as its factorization.

129285733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3494246.

The product of its digits is 90720, while the sum is 40.

The square root of 129285733 is about 11370.3884278419. The cubic root of 129285733 is about 505.6502201796.

It can be divided in two parts, 1292 and 85733, that added together give a square (87025 = 295²).

The spelling of 129285733 in words is "one hundred twenty-nine million, two hundred eighty-five thousand, seven hundred thirty-three".