161803842 has 48 divisors (see below), whose sum is σ = 337216512. Its totient is φ = 51740640.

The previous prime is 161803823. The next prime is 161803897. The reversal of 161803842 is 248308161.

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 23 ways as a sum of consecutive naturals, for example, 1273983 + ... + 1274109.

It is an arithmetic number, because the mean of its divisors is an integer number (7025344).

Almost surely, 2^161803842 is an apocalyptic number.

161803842 is an abundant number, since it is smaller than the sum of its proper divisors (175412670).

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

161803842 is a wasteful number, since it uses less digits than its factorization.

161803842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 161803842 is about 12720.2139132956. The cubic root of 161803842 is about 544.9160625999.

The spelling of 161803842 in words is "one hundred sixty-one million, eight hundred three thousand, eight hundred forty-two".