18344385 has 24 divisors (see below), whose sum is σ = 32895720. Its totient is φ = 9445632.

The previous prime is 18344383. The next prime is 18344387. The reversal of 18344385 is 58344381.

It is an interprime number because it is at equal distance from previous prime (18344383) and next prime (18344387).

It can be written as a sum of positive squares in 4 ways, for example, as 17424 + 18326961 = 132^2 + 4281^2 .

It is not a de Polignac number, because 18344385 - 2¹ = 18344383 is a prime.

It is a super-2 number, since 2×18344385² = 673032922056450, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18344383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5724 + ... + 8333.

It is an arithmetic number, because the mean of its divisors is an integer number (1370655).

Almost surely, 2^18344385 is an apocalyptic number.

18344385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18344385 is a deficient number, since it is larger than the sum of its proper divisors (14551335).

18344385 is a wasteful number, since it uses less digits than its factorization.

18344385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14097 (or 14094 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 18344385 is about 4283.0345550789. The cubic root of 18344385 is about 263.7349699064.

The spelling of 18344385 in words is "eighteen million, three hundred forty-four thousand, three hundred eighty-five".