129861742 has 8 divisors (see below), whose sum is σ = 206251056. Its totient is φ = 61111392.

The previous prime is 129861737. The next prime is 129861761. The reversal of 129861742 is 247168921.

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

It is a junction number, because it is equal to n+sod(n) for n = 129861695 and 129861704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1909698 + ... + 1909765.

It is an arithmetic number, because the mean of its divisors is an integer number (25781382).

Almost surely, 2^129861742 is an apocalyptic number.

129861742 is a deficient number, since it is larger than the sum of its proper divisors (76389314).

129861742 is a wasteful number, since it uses less digits than its factorization.

129861742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3819482.

The product of its digits is 48384, while the sum is 40.

The square root of 129861742 is about 11395.6896237130. The cubic root of 129861742 is about 506.4000518066.

The spelling of 129861742 in words is "one hundred twenty-nine million, eight hundred sixty-one thousand, seven hundred forty-two".