129836742 has 32 divisors (see below), whose sum is σ = 306345984. Its totient is φ = 35899200.

The previous prime is 129836723. The next prime is 129836743. The reversal of 129836742 is 247638921.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 129836694 and 129836703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129836743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48559 + ... + 51162.

It is an arithmetic number, because the mean of its divisors is an integer number (9573312).

Almost surely, 2^129836742 is an apocalyptic number.

129836742 is an abundant number, since it is smaller than the sum of its proper divisors (176509242).

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

129836742 is a wasteful number, since it uses less digits than its factorization.

129836742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99764.

The product of its digits is 145152, while the sum is 42.

The square root of 129836742 is about 11394.5926649442. The cubic root of 129836742 is about 506.3675536189.

The spelling of 129836742 in words is "one hundred twenty-nine million, eight hundred thirty-six thousand, seven hundred forty-two".