129170638 has 4 divisors (see below), whose sum is σ = 193755960. Its totient is φ = 64585318.

The previous prime is 129170621. The next prime is 129170677. The reversal of 129170638 is 836071921.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 129170597 and 129170606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32292658 + ... + 32292661.

It is an arithmetic number, because the mean of its divisors is an integer number (48438990).

Almost surely, 2^129170638 is an apocalyptic number.

129170638 is a deficient number, since it is larger than the sum of its proper divisors (64585322).

129170638 is an equidigital number, since it uses as much as digits as its factorization.

129170638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64585321.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 129170638 is about 11365.3261281848. The cubic root of 129170638 is about 505.5001260451.

The spelling of 129170638 in words is "one hundred twenty-nine million, one hundred seventy thousand, six hundred thirty-eight".