129087742 has 16 divisors (see below), whose sum is σ = 223961472. Its totient is φ = 54656280.

The previous prime is 129087713. The next prime is 129087769. The reversal of 129087742 is 247780921.

It is a junction number, because it is equal to n+sod(n) for n = 129087695 and 129087704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54384 + ... + 56707.

It is an arithmetic number, because the mean of its divisors is an integer number (13997592).

Almost surely, 2^129087742 is an apocalyptic number.

129087742 is a deficient number, since it is larger than the sum of its proper divisors (94873730).

129087742 is a wasteful number, since it uses less digits than its factorization.

129087742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111183.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 129087742 is about 11361.6786611838. The cubic root of 129087742 is about 505.3919670333.

The spelling of 129087742 in words is "one hundred twenty-nine million, eighty-seven thousand, seven hundred forty-two".