129142794 has 32 divisors (see below), whose sum is σ = 284414976. Its totient is φ = 38766320.

The previous prime is 129142789. The next prime is 129142817. The reversal of 129142794 is 497241921.

It is a super-2 number, since 2×129142794² = 33355722484252872, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2082 + ... + 16205.

It is an arithmetic number, because the mean of its divisors is an integer number (8887968).

Almost surely, 2^129142794 is an apocalyptic number.

129142794 is an abundant number, since it is smaller than the sum of its proper divisors (155272182).

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

129142794 is a wasteful number, since it uses less digits than its factorization.

129142794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18410.

The product of its digits is 36288, while the sum is 39.

The square root of 129142794 is about 11364.1011083147. The cubic root of 129142794 is about 505.4638015955.

It can be divided in two parts, 1 and 29142794, that added together give a triangular number (29142795 = T₇₆₃₄).

The spelling of 129142794 in words is "one hundred twenty-nine million, one hundred forty-two thousand, seven hundred ninety-four".