129991746 has 32 divisors (see below), whose sum is σ = 269827200. Its totient is φ = 41699840.

The previous prime is 129991703. The next prime is 129991751. The reversal of 129991746 is 647199921.

It is a junction number, because it is equal to n+sod(n) for n = 129991695 and 129991704.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61426 + ... + 63506.

It is an arithmetic number, because the mean of its divisors is an integer number (8432100).

Almost surely, 2^129991746 is an apocalyptic number.

129991746 is an abundant number, since it is smaller than the sum of its proper divisors (139835454).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129991746 is a wasteful number, since it uses less digits than its factorization.

129991746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2474.

The product of its digits is 244944, while the sum is 48.

The square root of 129991746 is about 11401.3922834012. The cubic root of 129991746 is about 506.5689803784.

The spelling of 129991746 in words is "one hundred twenty-nine million, nine hundred ninety-one thousand, seven hundred forty-six".