161843472 has 90 divisors (see below), whose sum is σ = 526908798. Its totient is φ = 46238976.

The previous prime is 161843471. The next prime is 161843491. The reversal of 161843472 is 274348161.

161843472 is a `hidden beast` number, since 1 + 6 + 184 + 3 + 472 = 666.

It can be written as a sum of positive squares in only one way, i.e., 121088016 + 40755456 = 11004^2 + 6384^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (161843471) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4413 + ... + 18524.

Almost surely, 2^161843472 is an apocalyptic number.

161843472 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 161843472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263454399).

161843472 is an abundant number, since it is smaller than the sum of its proper divisors (365065326).

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

161843472 is a wasteful number, since it uses less digits than its factorization.

161843472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22965 (or 22949 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 161843472 is about 12721.7715747454. The cubic root of 161843472 is about 544.9605470416.

The spelling of 161843472 in words is "one hundred sixty-one million, eight hundred forty-three thousand, four hundred seventy-two".