161940240 has 480 divisors, whose sum is σ = 713097216. Its totient is φ = 31933440.

The previous prime is 161940223. The next prime is 161940277. The reversal of 161940240 is 42049161.

161940240 is a `hidden beast` number, since 1 + 619 + 4 + 0 + 2 + 40 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1275057 + ... + 1275183.

Almost surely, 2^161940240 is an apocalyptic number.

161940240 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 161940240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (356548608).

161940240 is an abundant number, since it is smaller than the sum of its proper divisors (551156976).

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

161940240 is a wasteful number, since it uses less digits than its factorization.

161940240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 161940240 is about 12725.5742503040. The cubic root of 161940240 is about 545.0691380459.

The spelling of 161940240 in words is "one hundred sixty-one million, nine hundred forty thousand, two hundred forty".