129942686 has 16 divisors (see below), whose sum is σ = 207719424. Its totient is φ = 60823224.

The previous prime is 129942677. The next prime is 129942737. The reversal of 129942686 is 686249921.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a self number, because there is not a number n which added to its sum of digits gives 129942686.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27890 + ... + 32213.

It is an arithmetic number, because the mean of its divisors is an integer number (12982464).

Almost surely, 2^129942686 is an apocalyptic number.

129942686 is a deficient number, since it is larger than the sum of its proper divisors (77776738).

129942686 is a wasteful number, since it uses less digits than its factorization.

129942686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60175.

The product of its digits is 373248, while the sum is 47.

The square root of 129942686 is about 11399.2405887410. The cubic root of 129942686 is about 506.5052445334.

The spelling of 129942686 in words is "one hundred twenty-nine million, nine hundred forty-two thousand, six hundred eighty-six".