161800732 has 24 divisors (see below), whose sum is σ = 303685200. Its totient is φ = 75194496.

The previous prime is 161800729. The next prime is 161800733. The reversal of 161800732 is 237008161.

It is a self number, because there is not a number n which added to its sum of digits gives 161800732.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161800733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16057 + ... + 24112.

It is an arithmetic number, because the mean of its divisors is an integer number (12653550).

Almost surely, 2^161800732 is an apocalyptic number.

It is an amenable number.

161800732 is a deficient number, since it is larger than the sum of its proper divisors (141884468).

161800732 is a wasteful number, since it uses less digits than its factorization.

161800732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40245 (or 40243 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 161800732 is about 12720.0916663364. The cubic root of 161800732 is about 544.9125713359.

Adding to 161800732 its reverse (237008161), we get a palindrome (398808893).

The spelling of 161800732 in words is "one hundred sixty-one million, eight hundred thousand, seven hundred thirty-two".