161173920 has 96 divisors (see below), whose sum is σ = 509483520. Its totient is φ = 42828800.

The previous prime is 161173913. The next prime is 161173921. The reversal of 161173920 is 29371161.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (161173921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229570 + ... + 230270.

It is an arithmetic number, because the mean of its divisors is an integer number (5307120).

Almost surely, 2^161173920 is an apocalyptic number.

161173920 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 161173920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254741760).

161173920 is an abundant number, since it is smaller than the sum of its proper divisors (348309600).

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

161173920 is a wasteful number, since it uses less digits than its factorization.

161173920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1198 (or 1190 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 161173920 is about 12695.4290986953. The cubic root of 161173920 is about 544.2080014858.

The spelling of 161173920 in words is "one hundred sixty-one million, one hundred seventy-three thousand, nine hundred twenty".