161940 has 24 divisors (see below), whose sum is σ = 453600. Its totient is φ = 43168.

The previous prime is 161923. The next prime is 161947. The reversal of 161940 is 49161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161947) by changing a digit.

161940 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1290 + ... + 1409.

It is an arithmetic number, because the mean of its divisors is an integer number (18900).

2¹⁶¹⁹⁴⁰ is an apocalyptic number.

161940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161940 is an abundant number, since it is smaller than the sum of its proper divisors (291660).

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

161940 is a wasteful number, since it uses less digits than its factorization.

161940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2711 (or 2709 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 161940 is about 402.4176934480. The cubic root of 161940 is about 54.5068868776.

The spelling of 161940 in words is "one hundred sixty-one thousand, nine hundred forty".