161940239 has 8 divisors (see below), whose sum is σ = 167095488. Its totient is φ = 156856320.

The previous prime is 161940223. The next prime is 161940277. The reversal of 161940239 is 932049161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161940239 - 2⁴ = 161940223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161940199 and 161940208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161940209) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 13202 + ... + 22319.

It is an arithmetic number, because the mean of its divisors is an integer number (20886936).

Almost surely, 2^161940239 is an apocalyptic number.

161940239 is a deficient number, since it is larger than the sum of its proper divisors (5155249).

161940239 is an equidigital number, since it uses as much as digits as its factorization.

161940239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35665.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 161940239 is about 12725.5742110130. The cubic root of 161940239 is about 545.0691369240.

The spelling of 161940239 in words is "one hundred sixty-one million, nine hundred forty thousand, two hundred thirty-nine".