161240 has 32 divisors (see below), whose sum is σ = 378000. Its totient is φ = 61824.

The previous prime is 161237. The next prime is 161263. The reversal of 161240 is 42161.

Added to its reverse (42161) it gives a square (203401 = 451²).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1091 + ... + 1229.

2¹⁶¹²⁴⁰ is an apocalyptic number.

161240 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 161240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189000).

161240 is an abundant number, since it is smaller than the sum of its proper divisors (216760).

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

161240 is a wasteful number, since it uses less digits than its factorization.

161240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 161240 is about 401.5470084560. The cubic root of 161240 is about 54.4282364946.

Adding to 161240 its reverse (42161), we get a square (203401 = 451²).

The spelling of 161240 in words is "one hundred sixty-one thousand, two hundred forty".