129947442 has 16 divisors (see below), whose sum is σ = 260286912. Its totient is φ = 43250480.

The previous prime is 129947417. The next prime is 129947449. The reversal of 129947442 is 244749921.

It is a junction number, because it is equal to n+sod(n) for n = 129947394 and 129947403.

It is not an unprimeable number, because it can be changed into a prime (129947449) 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, 11934 + ... + 20057.

It is an arithmetic number, because the mean of its divisors is an integer number (16267932).

Almost surely, 2^129947442 is an apocalyptic number.

129947442 is an abundant number, since it is smaller than the sum of its proper divisors (130339470).

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

129947442 is a wasteful number, since it uses less digits than its factorization.

129947442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32673.

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

The square root of 129947442 is about 11399.4491972200. The cubic root of 129947442 is about 506.5114239489.

The spelling of 129947442 in words is "one hundred twenty-nine million, nine hundred forty-seven thousand, four hundred forty-two".