161860385 has 16 divisors (see below), whose sum is σ = 204131136. Its totient is φ = 123052608.

The previous prime is 161860367. The next prime is 161860403. The reversal of 161860385 is 583068161.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (161860367) and next prime (161860403).

It is a cyclic number.

It is not a de Polignac number, because 161860385 - 2²⁰ = 160811809 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

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 15 ways as a sum of consecutive naturals, for example, 2219 + ... + 18128.

It is an arithmetic number, because the mean of its divisors is an integer number (12758196).

Almost surely, 2^161860385 is an apocalyptic number.

It is an amenable number.

161860385 is a deficient number, since it is larger than the sum of its proper divisors (42270751).

161860385 is a wasteful number, since it uses less digits than its factorization.

161860385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20432.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 161860385 is about 12722.4362839827. The cubic root of 161860385 is about 544.9795295737.

The spelling of 161860385 in words is "one hundred sixty-one million, eight hundred sixty thousand, three hundred eighty-five".