161860140 has 96 divisors (see below), whose sum is σ = 542324160. Its totient is φ = 39840768.

The previous prime is 161860099. The next prime is 161860189. The reversal of 161860140 is 41068161.

161860140 is a `hidden beast` number, since 1 + 6 + 18 + 601 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4509 + ... + 18548.

It is an arithmetic number, because the mean of its divisors is an integer number (5649210).

Almost surely, 2^161860140 is an apocalyptic number.

161860140 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 161860140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271162080).

161860140 is an abundant number, since it is smaller than the sum of its proper divisors (380464020).

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

161860140 is a wasteful number, since it uses less digits than its factorization.

161860140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23088 (or 23080 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 161860140 is about 12722.4266553201. The cubic root of 161860140 is about 544.9792546041.

The spelling of 161860140 in words is "one hundred sixty-one million, eight hundred sixty thousand, one hundred forty".