18055390 has 16 divisors (see below), whose sum is σ = 33033600. Its totient is φ = 7103520.

The previous prime is 18055381. The next prime is 18055393. The reversal of 18055390 is 9355081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18055393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14190 + ... + 15409.

It is an arithmetic number, because the mean of its divisors is an integer number (2064600).

Almost surely, 2^18055390 is an apocalyptic number.

18055390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18055390 is a deficient number, since it is larger than the sum of its proper divisors (14978210).

18055390 is a wasteful number, since it uses less digits than its factorization.

18055390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29667.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 18055390 is about 4249.1634470799. The cubic root of 18055390 is about 262.3426842735.

The spelling of 18055390 in words is "eighteen million, fifty-five thousand, three hundred ninety".