17989145 has 16 divisors (see below), whose sum is σ = 23597568. Its totient is φ = 13105920.

The previous prime is 17989133. The next prime is 17989177. The reversal of 17989145 is 54198971.

It is not a de Polignac number, because 17989145 - 2¹² = 17985049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 17989096 and 17989105.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 779 + ... + 6048.

It is an arithmetic number, because the mean of its divisors is an integer number (1474848).

Almost surely, 2^17989145 is an apocalyptic number.

It is an amenable number.

17989145 is a deficient number, since it is larger than the sum of its proper divisors (5608423).

17989145 is a wasteful number, since it uses less digits than its factorization.

17989145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6880.

The product of its digits is 90720, while the sum is 44.

The square root of 17989145 is about 4241.3612201745. The cubic root of 17989145 is about 262.0214470721.

The spelling of 17989145 in words is "seventeen million, nine hundred eighty-nine thousand, one hundred forty-five".