129823814 has 4 divisors (see below), whose sum is σ = 194735724. Its totient is φ = 64911906.

The previous prime is 129823739. The next prime is 129823831. The reversal of 129823814 is 418328921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 418328921 = 9613 ⋅43517.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32455952 + ... + 32455955.

It is an arithmetic number, because the mean of its divisors is an integer number (48683931).

Almost surely, 2^129823814 is an apocalyptic number.

129823814 is a deficient number, since it is larger than the sum of its proper divisors (64911910).

129823814 is an equidigital number, since it uses as much as digits as its factorization.

129823814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64911909.

The product of its digits is 27648, while the sum is 38.

The square root of 129823814 is about 11394.0253641986. The cubic root of 129823814 is about 506.3507465197.

The spelling of 129823814 in words is "one hundred twenty-nine million, eight hundred twenty-three thousand, eight hundred fourteen".