129386953 has 4 divisors (see below), whose sum is σ = 129412368. Its totient is φ = 129361540.

The previous prime is 129386947. The next prime is 129386969. The reversal of 129386953 is 359683921.

It is a happy number.

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: 359683921 = 73 ⋅4927177.

It is a cyclic number.

It is not a de Polignac number, because 129386953 - 2¹⁷ = 129255881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129386923) 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, 2143 + ... + 16228.

It is an arithmetic number, because the mean of its divisors is an integer number (32353092).

Almost surely, 2^129386953 is an apocalyptic number.

It is an amenable number.

129386953 is a deficient number, since it is larger than the sum of its proper divisors (25415).

129386953 is an equidigital number, since it uses as much as digits as its factorization.

129386953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25414.

The product of its digits is 349920, while the sum is 46.

The square root of 129386953 is about 11374.8385922614. The cubic root of 129386953 is about 505.7821464766.

It can be divided in two parts, 12938 and 6953, that added together give a palindrome (19891).

The spelling of 129386953 in words is "one hundred twenty-nine million, three hundred eighty-six thousand, nine hundred fifty-three".