129799305 has 24 divisors (see below), whose sum is σ = 226299528. Its totient is φ = 68822016.

The previous prime is 129799303. The next prime is 129799309. The reversal of 129799305 is 503997921.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 69705801 + 60093504 = 8349^2 + 7752^2 .

It is not a de Polignac number, because 129799305 - 2¹ = 129799303 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (129799303) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 552 + ... + 16121.

It is an arithmetic number, because the mean of its divisors is an integer number (9429147).

Almost surely, 2^129799305 is an apocalyptic number.

129799305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129799305 is a deficient number, since it is larger than the sum of its proper divisors (96500223).

129799305 is a wasteful number, since it uses less digits than its factorization.

129799305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16857 (or 16854 counting only the distinct ones).

The product of its (nonzero) digits is 153090, while the sum is 45.

The square root of 129799305 is about 11392.9497936224. The cubic root of 129799305 is about 506.3188804311.

The spelling of 129799305 in words is "one hundred twenty-nine million, seven hundred ninety-nine thousand, three hundred five".