129040393 has 4 divisors (see below), whose sum is σ = 129070800. Its totient is φ = 129009988.

The previous prime is 129040367. The next prime is 129040397. The reversal of 129040393 is 393040921.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129040393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129040397) 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, 7555 + ... + 17752.

It is an arithmetic number, because the mean of its divisors is an integer number (32267700).

Almost surely, 2^129040393 is an apocalyptic number.

It is an amenable number.

129040393 is a deficient number, since it is larger than the sum of its proper divisors (30407).

129040393 is an equidigital number, since it uses as much as digits as its factorization.

129040393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30406.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 129040393 is about 11359.5947550958. The cubic root of 129040393 is about 505.3301673863.

It can be divided in two parts, 1290403 and 93, that added together give a square (1290496 = 1136²).

The spelling of 129040393 in words is "one hundred twenty-nine million, forty thousand, three hundred ninety-three".