129427643 has 8 divisors (see below), whose sum is σ = 132243408. Its totient is φ = 126625824.

The previous prime is 129427633. The next prime is 129427657. The reversal of 129427643 is 346724921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129427643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129427597 and 129427606.

It is not an unprimeable number, because it can be changed into a prime (129427603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16496 + ... + 23042.

It is an arithmetic number, because the mean of its divisors is an integer number (16530426).

Almost surely, 2^129427643 is an apocalyptic number.

129427643 is a deficient number, since it is larger than the sum of its proper divisors (2815765).

129427643 is an equidigital number, since it uses as much as digits as its factorization.

129427643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6973.

The product of its digits is 72576, while the sum is 38.

The square root of 129427643 is about 11376.6270484709. The cubic root of 129427643 is about 505.8351608856.

The spelling of 129427643 in words is "one hundred twenty-nine million, four hundred twenty-seven thousand, six hundred forty-three".