161827939 has 12 divisors (see below), whose sum is σ = 202730304. Its totient is φ = 128039184.

The previous prime is 161827901. The next prime is 161827949. The reversal of 161827939 is 939728161.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-161827939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161827949) 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 11 ways as a sum of consecutive naturals, for example, 126387 + ... + 127660.

It is an arithmetic number, because the mean of its divisors is an integer number (16894192).

Almost surely, 2^161827939 is an apocalyptic number.

161827939 is a deficient number, since it is larger than the sum of its proper divisors (40902365).

161827939 is a wasteful number, since it uses less digits than its factorization.

161827939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254074 (or 254067 counting only the distinct ones).

The product of its digits is 163296, while the sum is 46.

The square root of 161827939 is about 12721.1610712230. The cubic root of 161827939 is about 544.9431122060.

It can be divided in two parts, 161 and 827939, that added together give a square (828100 = 910²).

The spelling of 161827939 in words is "one hundred sixty-one million, eight hundred twenty-seven thousand, nine hundred thirty-nine".