129427886 has 24 divisors (see below), whose sum is σ = 234177840. Its totient is φ = 52547616.

The previous prime is 129427871. The next prime is 129427891. The reversal of 129427886 is 688724921.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 129427886.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7751 + ... + 17858.

It is an arithmetic number, because the mean of its divisors is an integer number (9757410).

Almost surely, 2^129427886 is an apocalyptic number.

129427886 is a deficient number, since it is larger than the sum of its proper divisors (104749954).

129427886 is a wasteful number, since it uses less digits than its factorization.

129427886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25656 (or 25637 counting only the distinct ones).

The product of its digits is 387072, while the sum is 47.

The square root of 129427886 is about 11376.6377282570. The cubic root of 129427886 is about 505.8354774533.

The spelling of 129427886 in words is "one hundred twenty-nine million, four hundred twenty-seven thousand, eight hundred eighty-six".