129823813 has 8 divisors (see below), whose sum is σ = 148621760. Its totient is φ = 111088800.

The previous prime is 129823739. The next prime is 129823831. The reversal of 129823813 is 318328921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129823813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129823843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11223 + ... + 19636.

It is an arithmetic number, because the mean of its divisors is an integer number (18577720).

Almost surely, 2^129823813 is an apocalyptic number.

It is an amenable number.

129823813 is a deficient number, since it is larger than the sum of its proper divisors (18797947).

129823813 is an equidigital number, since it uses as much as digits as its factorization.

129823813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31467.

The product of its digits is 20736, while the sum is 37.

The square root of 129823813 is about 11394.0253203159. The cubic root of 129823813 is about 506.3507452196.

The spelling of 129823813 in words is "one hundred twenty-nine million, eight hundred twenty-three thousand, eight hundred thirteen".