161727930 has 288 divisors, whose sum is σ = 548121600. Its totient is φ = 33022080.

The previous prime is 161727901. The next prime is 161727971. The reversal of 161727930 is 39727161.

It is a happy number.

161727930 is a `hidden beast` number, since 1 + 617 + 2 + 7 + 9 + 30 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 5217015 + ... + 5217045.

It is an arithmetic number, because the mean of its divisors is an integer number (1903200).

Almost surely, 2^161727930 is an apocalyptic number.

161727930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161727930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274060800).

161727930 is an abundant number, since it is smaller than the sum of its proper divisors (386393670).

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

161727930 is a wasteful number, since it uses less digits than its factorization.

161727930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91 (or 61 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 36.

The square root of 161727930 is about 12717.2296511465. The cubic root of 161727930 is about 544.8308315400.

The spelling of 161727930 in words is "one hundred sixty-one million, seven hundred twenty-seven thousand, nine hundred thirty".