129787693 has 4 divisors (see below), whose sum is σ = 148328800. Its totient is φ = 111246588.

The previous prime is 129787667. The next prime is 129787699. The reversal of 129787693 is 396787921.

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: 396787921 = 59 ⋅6725219.

It is a cyclic number.

It is not a de Polignac number, because 129787693 - 2²⁵ = 96233261 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129787693.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129787699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9270543 + ... + 9270556.

It is an arithmetic number, because the mean of its divisors is an integer number (37082200).

Almost surely, 2^129787693 is an apocalyptic number.

It is an amenable number.

129787693 is a deficient number, since it is larger than the sum of its proper divisors (18541107).

129787693 is an equidigital number, since it uses as much as digits as its factorization.

129787693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18541106.

The product of its digits is 1143072, while the sum is 52.

The square root of 129787693 is about 11392.4401688137. The cubic root of 129787693 is about 506.3037813513.

The spelling of 129787693 in words is "one hundred twenty-nine million, seven hundred eighty-seven thousand, six hundred ninety-three".