129787942 has 8 divisors (see below), whose sum is σ = 203146416. Its totient is φ = 62072472.

The previous prime is 129787939. The next prime is 129787943. The reversal of 129787942 is 249787921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129787943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1410693 + ... + 1410784.

It is an arithmetic number, because the mean of its divisors is an integer number (25393302).

Almost surely, 2^129787942 is an apocalyptic number.

129787942 is a deficient number, since it is larger than the sum of its proper divisors (73358474).

129787942 is a wasteful number, since it uses less digits than its factorization.

129787942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2821502.

The product of its digits is 508032, while the sum is 49.

The square root of 129787942 is about 11392.4510971081. The cubic root of 129787942 is about 506.3041051354.

It can be divided in two parts, 1297879 and 42, that added together give a palindrome (1297921).

The spelling of 129787942 in words is "one hundred twenty-nine million, seven hundred eighty-seven thousand, nine hundred forty-two".