18026385 has 32 divisors (see below), whose sum is σ = 31301760. Its totient is φ = 8858304.

The previous prime is 18026381. The next prime is 18026387. The reversal of 18026385 is 58362081.

It is a happy number.

It is not a de Polignac number, because 18026385 - 2² = 18026381 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18026381) 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 31 ways as a sum of consecutive naturals, for example, 32682 + ... + 33228.

It is an arithmetic number, because the mean of its divisors is an integer number (978180).

Almost surely, 2^18026385 is an apocalyptic number.

18026385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18026385 is a deficient number, since it is larger than the sum of its proper divisors (13275375).

18026385 is an equidigital number, since it uses as much as digits as its factorization.

18026385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594 (or 568 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 18026385 is about 4245.7490505210. The cubic root of 18026385 is about 262.2021292405.

It can be divided in two parts, 180 and 26385, that added together give a triangular number (26565 = T₂₃₀).

The spelling of 18026385 in words is "eighteen million, twenty-six thousand, three hundred eighty-five".