129786427 has 4 divisors (see below), whose sum is σ = 132804760. Its totient is φ = 126768096.

The previous prime is 129786413. The next prime is 129786431. The reversal of 129786427 is 724687921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 724687921 = 53 ⋅13673357.

It is a cyclic number.

It is not a de Polignac number, because 129786427 - 2⁷ = 129786299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129786127) 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, 1509102 + ... + 1509187.

It is an arithmetic number, because the mean of its divisors is an integer number (33201190).

Almost surely, 2^129786427 is an apocalyptic number.

129786427 is a deficient number, since it is larger than the sum of its proper divisors (3018333).

129786427 is an equidigital number, since it uses as much as digits as its factorization.

129786427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3018332.

The product of its digits is 338688, while the sum is 46.

The square root of 129786427 is about 11392.3846055161. The cubic root of 129786427 is about 506.3021351175.

The spelling of 129786427 in words is "one hundred twenty-nine million, seven hundred eighty-six thousand, four hundred twenty-seven".