17997645 has 32 divisors (see below), whose sum is σ = 30748032. Its totient is φ = 8957952.

The previous prime is 17997643. The next prime is 17997649. The reversal of 17997645 is 54679971.

It is a happy number.

It is not a de Polignac number, because 17997645 - 2¹ = 17997643 is a prime.

It is a super-3 number, since 3×17997645³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 17997594 and 17997603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17997641) 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 31 ways as a sum of consecutive naturals, for example, 41349 + ... + 41781.

It is an arithmetic number, because the mean of its divisors is an integer number (960876).

Almost surely, 2^17997645 is an apocalyptic number.

17997645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

17997645 is a deficient number, since it is larger than the sum of its proper divisors (12750387).

17997645 is a wasteful number, since it uses less digits than its factorization.

17997645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621.

The product of its digits is 476280, while the sum is 48.

The square root of 17997645 is about 4242.3631386292. The cubic root of 17997645 is about 262.0627095780.

The spelling of 17997645 in words is "seventeen million, nine hundred ninety-seven thousand, six hundred forty-five".