17989872 has 20 divisors (see below), whose sum is σ = 46473960. Its totient is φ = 5996608.

The previous prime is 17989871. The next prime is 17989879. The reversal of 17989872 is 27898971.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17989871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187347 + ... + 187442.

It is an arithmetic number, because the mean of its divisors is an integer number (2323698).

Almost surely, 2^17989872 is an apocalyptic number.

17989872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

17989872 is an abundant number, since it is smaller than the sum of its proper divisors (28484088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

17989872 is a wasteful number, since it uses less digits than its factorization.

17989872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374800 (or 374794 counting only the distinct ones).

The product of its digits is 508032, while the sum is 51.

The square root of 17989872 is about 4241.4469229262. The cubic root of 17989872 is about 262.0249767382.

Subtracting 17989872 from its reverse (27898971), we obtain a palindrome (9909099).

The spelling of 17989872 in words is "seventeen million, nine hundred eighty-nine thousand, eight hundred seventy-two".