18161384 has 8 divisors (see below), whose sum is σ = 34052610. Its totient is φ = 9080688.

The previous prime is 18161383. The next prime is 18161387. The reversal of 18161384 is 48316181.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17556100 + 605284 = 4190^2 + 778^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 18161384.

It is not an unprimeable number, because it can be changed into a prime (18161383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1135079 + ... + 1135094.

Almost surely, 2^18161384 is an apocalyptic number.

It is an amenable number.

18161384 is a deficient number, since it is larger than the sum of its proper divisors (15891226).

18161384 is a wasteful number, since it uses less digits than its factorization.

18161384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270179 (or 2270175 counting only the distinct ones).

The product of its digits is 4608, while the sum is 32.

The square root of 18161384 is about 4261.6175332848. The cubic root of 18161384 is about 262.8550430789.

The spelling of 18161384 in words is "eighteen million, one hundred sixty-one thousand, three hundred eighty-four".