129850478 has 4 divisors (see below), whose sum is σ = 194775720. Its totient is φ = 64925238.

The previous prime is 129850451. The next prime is 129850499. The reversal of 129850478 is 874058921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 874058921 = 15077 ⋅57973.

It is a super-2 number, since 2×129850478² = 33722293273656968, which contains 22 as substring.

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, 32462618 + ... + 32462621.

It is an arithmetic number, because the mean of its divisors is an integer number (48693930).

Almost surely, 2^129850478 is an apocalyptic number.

129850478 is a deficient number, since it is larger than the sum of its proper divisors (64925242).

129850478 is an equidigital number, since it uses as much as digits as its factorization.

129850478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64925241.

The product of its (nonzero) digits is 161280, while the sum is 44.

The square root of 129850478 is about 11395.1953910409. The cubic root of 129850478 is about 506.3854099395.

The spelling of 129850478 in words is "one hundred twenty-nine million, eight hundred fifty thousand, four hundred seventy-eight".