161399186 has 32 divisors (see below), whose sum is σ = 277603200. Its totient is φ = 69759360.

The previous prime is 161399153. The next prime is 161399197. The reversal of 161399186 is 681993161.

It is a happy 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, 42131 + ... + 45801.

It is an arithmetic number, because the mean of its divisors is an integer number (8675100).

Almost surely, 2^161399186 is an apocalyptic number.

161399186 is a deficient number, since it is larger than the sum of its proper divisors (116204014).

161399186 is a wasteful number, since it uses less digits than its factorization.

161399186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3794.

The product of its digits is 69984, while the sum is 44.

The square root of 161399186 is about 12704.2979341639. The cubic root of 161399186 is about 544.4614223252.

The spelling of 161399186 in words is "one hundred sixty-one million, three hundred ninety-nine thousand, one hundred eighty-six".