129927841 has 4 divisors (see below), whose sum is σ = 129985684. Its totient is φ = 129870000.

The previous prime is 129927823. The next prime is 129927869. The reversal of 129927841 is 148729921.

It is a happy number.

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 96334225 + 33593616 = 9815^2 + 5796^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129927841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129927341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25410 + ... + 30091.

It is an arithmetic number, because the mean of its divisors is an integer number (32496421).

Almost surely, 2^129927841 is an apocalyptic number.

It is an amenable number.

129927841 is a deficient number, since it is larger than the sum of its proper divisors (57843).

129927841 is an equidigital number, since it uses as much as digits as its factorization.

129927841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57842.

The product of its digits is 72576, while the sum is 43.

The square root of 129927841 is about 11398.5894302760. The cubic root of 129927841 is about 506.4859556276.

The spelling of 129927841 in words is "one hundred twenty-nine million, nine hundred twenty-seven thousand, eight hundred forty-one".