161798238 has 96 divisors (see below), whose sum is σ = 431788032. Its totient is φ = 42768000.

The previous prime is 161798227. The next prime is 161798249. The reversal of 161798238 is 832897161.

161798238 is a `hidden beast` number, since 1 + 617 + 9 + 8 + 23 + 8 = 666.

161798238 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161798227) and next prime (161798249).

It is a junction number, because it is equal to n+sod(n) for n = 161798193 and 161798202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 88938 + ... + 90738.

It is an arithmetic number, because the mean of its divisors is an integer number (4497792).

Almost surely, 2^161798238 is an apocalyptic number.

161798238 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161798238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215894016).

161798238 is an abundant number, since it is smaller than the sum of its proper divisors (269989794).

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

161798238 is a wasteful number, since it uses less digits than its factorization.

161798238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870 (or 1867 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 161798238 is about 12719.9936320739. The cubic root of 161798238 is about 544.9097715567.

The spelling of 161798238 in words is "one hundred sixty-one million, seven hundred ninety-eight thousand, two hundred thirty-eight".