18165740 has 12 divisors (see below), whose sum is σ = 38148096. Its totient is φ = 7266288.

The previous prime is 18165731. The next prime is 18165743. The reversal of 18165740 is 4756181.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18165697 and 18165706.

It is not an unprimeable number, because it can be changed into a prime (18165743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454124 + ... + 454163.

It is an arithmetic number, because the mean of its divisors is an integer number (3179008).

Almost surely, 2^18165740 is an apocalyptic number.

18165740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18165740 is an abundant number, since it is smaller than the sum of its proper divisors (19982356).

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

18165740 is a wasteful number, since it uses less digits than its factorization.

18165740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908296 (or 908294 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 18165740 is about 4262.1285761929. The cubic root of 18165740 is about 262.8760566213.

The spelling of 18165740 in words is "eighteen million, one hundred sixty-five thousand, seven hundred forty".