18389161 has 12 divisors (see below), whose sum is σ = 22130820. Its totient is φ = 15217440.

The previous prime is 18389153. The next prime is 18389183. The reversal of 18389161 is 16198381.

It can be written as a sum of positive squares in 2 ways, for example, as 11861136 + 6528025 = 3444^2 + 2555^2 .

It is not a de Polignac number, because 18389161 - 2³ = 18389153 is a prime.

It is a super-2 number, since 2×18389161² = 676322484567842, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18389161.

It is not an unprimeable number, because it can be changed into a prime (18389101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5050 + ... + 7891.

It is an arithmetic number, because the mean of its divisors is an integer number (1844235).

Almost surely, 2^18389161 is an apocalyptic number.

It is an amenable number.

18389161 is a deficient number, since it is larger than the sum of its proper divisors (3741659).

18389161 is a wasteful number, since it uses less digits than its factorization.

18389161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12984 (or 12977 counting only the distinct ones).

The product of its digits is 10368, while the sum is 37.

The square root of 18389161 is about 4288.2585043348. The cubic root of 18389161 is about 263.9493752408.

The spelling of 18389161 in words is "eighteen million, three hundred eighty-nine thousand, one hundred sixty-one".