129999993 has 4 divisors (see below), whose sum is σ = 173333328. Its totient is φ = 86666660.

The previous prime is 129999983. The next prime is 129999997. The reversal of 129999993 is 399999921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 399999921 = 3 ⋅133333307.

It is a cyclic number.

It is not a de Polignac number, because 129999993 - 2⁶ = 129999929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129999997) 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, 21666663 + ... + 21666668.

It is an arithmetic number, because the mean of its divisors is an integer number (43333332).

Almost surely, 2^129999993 is an apocalyptic number.

It is an amenable number.

129999993 is a deficient number, since it is larger than the sum of its proper divisors (43333335).

129999993 is an equidigital number, since it uses as much as digits as its factorization.

129999993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43333334.

The product of its digits is 3188646, while the sum is 60.

The square root of 129999993 is about 11401.7539440211. The cubic root of 129999993 is about 506.5796928176.

The spelling of 129999993 in words is "one hundred twenty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-three".