17990989 has 8 divisors (see below), whose sum is σ = 18455040. Its totient is φ = 17530416.

The previous prime is 17990983. The next prime is 17991007. The reversal of 17990989 is 98909971.

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

It is a cyclic number.

It is not a de Polignac number, because 17990989 - 2⁵ = 17990957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17990983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11932 + ... + 13354.

It is an arithmetic number, because the mean of its divisors is an integer number (2306880).

Almost surely, 2^17990989 is an apocalyptic number.

It is an amenable number.

17990989 is a deficient number, since it is larger than the sum of its proper divisors (464051).

17990989 is a wasteful number, since it uses less digits than its factorization.

17990989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739.

The product of its (nonzero) digits is 367416, while the sum is 52.

The square root of 17990989 is about 4241.5785976450. The cubic root of 17990989 is about 262.0303997125.

The spelling of 17990989 in words is "seventeen million, nine hundred ninety thousand, nine hundred eighty-nine".