18381601 has 8 divisors (see below), whose sum is σ = 21101120. Its totient is φ = 15685488.

The previous prime is 18381593. The next prime is 18381613. The reversal of 18381601 is 10618381.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18381601 - 2³ = 18381593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18381601.

It is not an unprimeable number, because it can be changed into a prime (18381691) 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, 4131 + ... + 7336.

It is an arithmetic number, because the mean of its divisors is an integer number (2637640).

Almost surely, 2^18381601 is an apocalyptic number.

It is an amenable number.

18381601 is a deficient number, since it is larger than the sum of its proper divisors (2719519).

18381601 is a wasteful number, since it uses less digits than its factorization.

18381601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11703.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 18381601 is about 4287.3769370094. The cubic root of 18381601 is about 263.9131993871.

Adding to 18381601 its reverse (10618381), we get a palindrome (28999982).

The spelling of 18381601 in words is "eighteen million, three hundred eighty-one thousand, six hundred one".