161173940 has 48 divisors (see below), whose sum is σ = 361746000. Its totient is φ = 60106752.

The previous prime is 161173937. The next prime is 161173963. The reversal of 161173940 is 49371161.

161173940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 3118756 + 158055184 = 1766^2 + 12572^2 .

It is a junction number, because it is equal to n+sod(n) for n = 161173897 and 161173906.

It is a congruent 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, 34886 + ... + 39234.

It is an arithmetic number, because the mean of its divisors is an integer number (7536375).

Almost surely, 2^161173940 is an apocalyptic number.

161173940 is a gapful number since it is divisible by the number (10) 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 161173940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180873000).

161173940 is an abundant number, since it is smaller than the sum of its proper divisors (200572060).

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

161173940 is a wasteful number, since it uses less digits than its factorization.

161173940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4484 (or 4482 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 161173940 is about 12695.4298863804. The cubic root of 161173940 is about 544.2080239960.

The spelling of 161173940 in words is "one hundred sixty-one million, one hundred seventy-three thousand, nine hundred forty".