129823949 has 4 divisors (see below), whose sum is σ = 130239036. Its totient is φ = 129408864.

The previous prime is 129823943. The next prime is 129823961. The reversal of 129823949 is 949328921.

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 36990724 + 92833225 = 6082^2 + 9635^2 .

It is a cyclic number.

It is not a de Polignac number, because 129823949 - 2⁴ = 129823933 is a prime.

It is a super-3 number, since 3×129823949³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129823943) 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, 207074 + ... + 207699.

It is an arithmetic number, because the mean of its divisors is an integer number (32559759).

Almost surely, 2^129823949 is an apocalyptic number.

It is an amenable number.

129823949 is a deficient number, since it is larger than the sum of its proper divisors (415087).

129823949 is an equidigital number, since it uses as much as digits as its factorization.

129823949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415086.

The product of its digits is 279936, while the sum is 47.

The square root of 129823949 is about 11394.0312883544. The cubic root of 129823949 is about 506.3509220328.

The spelling of 129823949 in words is "one hundred twenty-nine million, eight hundred twenty-three thousand, nine hundred forty-nine".