129785942 has 16 divisors (see below), whose sum is σ = 228714192. Its totient is φ = 54455520.

The previous prime is 129785921. The next prime is 129785947. The reversal of 129785942 is 249587921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129785947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226613 + ... + 227184.

It is an arithmetic number, because the mean of its divisors is an integer number (14294637).

Almost surely, 2^129785942 is an apocalyptic number.

129785942 is a deficient number, since it is larger than the sum of its proper divisors (98928250).

129785942 is a wasteful number, since it uses less digits than its factorization.

129785942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453823.

The product of its digits is 362880, while the sum is 47.

The square root of 129785942 is about 11392.3633193469. The cubic root of 129785942 is about 506.3015044485.

The spelling of 129785942 in words is "one hundred twenty-nine million, seven hundred eighty-five thousand, nine hundred forty-two".