18165390 has 32 divisors (see below), whose sum is σ = 44012160. Its totient is φ = 4797984.

The previous prime is 18165347. The next prime is 18165391. The reversal of 18165390 is 9356181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18165391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 381 + ... + 6039.

It is an arithmetic number, because the mean of its divisors is an integer number (1375380).

Almost surely, 2^18165390 is an apocalyptic number.

18165390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18165390 is an abundant number, since it is smaller than the sum of its proper divisors (25846770).

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

18165390 is a wasteful number, since it uses less digits than its factorization.

18165390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5776.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 18165390 is about 4262.0875166988. The cubic root of 18165390 is about 262.8743683295.

The spelling of 18165390 in words is "eighteen million, one hundred sixty-five thousand, three hundred ninety".