161439222 has 96 divisors (see below), whose sum is σ = 392999040. Its totient is φ = 44042880.

The previous prime is 161439203. The next prime is 161439241. The reversal of 161439222 is 222934161.

It is an interprime number because it is at equal distance from previous prime (161439203) and next prime (161439241).

It is a self number, because there is not a number n which added to its sum of digits gives 161439222.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 711073 + ... + 711299.

It is an arithmetic number, because the mean of its divisors is an integer number (4093740).

Almost surely, 2^161439222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161439222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196499520).

161439222 is an abundant number, since it is smaller than the sum of its proper divisors (231559818).

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

161439222 is a wasteful number, since it uses less digits than its factorization.

161439222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 339 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 161439222 is about 12705.8735236897. The cubic root of 161439222 is about 544.5064375365.

The spelling of 161439222 in words is "one hundred sixty-one million, four hundred thirty-nine thousand, two hundred twenty-two".