161995938 has 64 divisors (see below), whose sum is σ = 369532800. Its totient is φ = 46932480.

The previous prime is 161995937. The next prime is 161995949. The reversal of 161995938 is 839599161.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (161995937) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 416248 + ... + 416636.

It is an arithmetic number, because the mean of its divisors is an integer number (5773950).

Almost surely, 2^161995938 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161995938, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184766400).

161995938 is an abundant number, since it is smaller than the sum of its proper divisors (207536862).

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

161995938 is a wasteful number, since it uses less digits than its factorization.

161995938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707.

The product of its digits is 524880, while the sum is 51.

The square root of 161995938 is about 12727.7624899273. The cubic root of 161995938 is about 545.1316215499.

The spelling of 161995938 in words is "one hundred sixty-one million, nine hundred ninety-five thousand, nine hundred thirty-eight".