181869916 has 6 divisors (see below), whose sum is σ = 318272360. Its totient is φ = 90934956.

The previous prime is 181869913. The next prime is 181869917. The reversal of 181869916 is 619968181.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 181869916.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181869913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22733736 + ... + 22733743.

Almost surely, 2^181869916 is an apocalyptic number.

It is an amenable number.

181869916 is a deficient number, since it is larger than the sum of its proper divisors (136402444).

181869916 is a wasteful number, since it uses less digits than its factorization.

181869916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45467483 (or 45467481 counting only the distinct ones).

The product of its digits is 186624, while the sum is 49.

The square root of 181869916 is about 13485.9154676277. The cubic root of 181869916 is about 566.5700616556.

The spelling of 181869916 in words is "one hundred eighty-one million, eight hundred sixty-nine thousand, nine hundred sixteen".