161729946 has 40 divisors (see below), whose sum is σ = 414168480. Its totient is φ = 46208232.

The previous prime is 161729941. The next prime is 161729983. The reversal of 161729946 is 649927161.

161729946 is a `hidden beast` number, since 1 + 617 + 29 + 9 + 4 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (161729941) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 70176 + ... + 72443.

It is an arithmetic number, because the mean of its divisors is an integer number (10354212).

Almost surely, 2^161729946 is an apocalyptic number.

161729946 is an abundant number, since it is smaller than the sum of its proper divisors (252438534).

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

161729946 is a wasteful number, since it uses less digits than its factorization.

161729946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142640 (or 142631 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 161729946 is about 12717.3089134455. The cubic root of 161729946 is about 544.8330953715.

The spelling of 161729946 in words is "one hundred sixty-one million, seven hundred twenty-nine thousand, nine hundred forty-six".