161939712 has 144 divisors (see below), whose sum is σ = 487126080. Its totient is φ = 47308800.

The previous prime is 161939707. The next prime is 161939731. The reversal of 161939712 is 217939161.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244662 + ... + 245322.

It is an arithmetic number, because the mean of its divisors is an integer number (3382820).

Almost surely, 2^161939712 is an apocalyptic number.

161939712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161939712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243563040).

161939712 is an abundant number, since it is smaller than the sum of its proper divisors (325186368).

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

161939712 is a wasteful number, since it uses less digits than its factorization.

161939712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720 (or 706 counting only the distinct ones).

The product of its digits is 20412, while the sum is 39.

The square root of 161939712 is about 12725.5535046614. The cubic root of 161939712 is about 545.0685456529.

The spelling of 161939712 in words is "one hundred sixty-one million, nine hundred thirty-nine thousand, seven hundred twelve".