129493985 has 4 divisors (see below), whose sum is σ = 155392788. Its totient is φ = 103595184.

The previous prime is 129493951. The next prime is 129493997. The reversal of 129493985 is 589394921.

It is a happy number.

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 19642624 + 109851361 = 4432^2 + 10481^2 .

It is a cyclic number.

It is not a de Polignac number, because 129493985 - 2⁶ = 129493921 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12949394 + ... + 12949403.

It is an arithmetic number, because the mean of its divisors is an integer number (38848197).

Almost surely, 2^129493985 is an apocalyptic number.

It is an amenable number.

129493985 is a deficient number, since it is larger than the sum of its proper divisors (25898803).

129493985 is an equidigital number, since it uses as much as digits as its factorization.

129493985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25898802.

The product of its digits is 699840, while the sum is 50.

The square root of 129493985 is about 11379.5423897449. The cubic root of 129493985 is about 505.9215730908.

The spelling of 129493985 in words is "one hundred twenty-nine million, four hundred ninety-three thousand, nine hundred eighty-five".