17948989 has 4 divisors (see below), whose sum is σ = 17969440. Its totient is φ = 17928540.

The previous prime is 17948963. The next prime is 17949007. The reversal of 17948989 is 98984971.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 17948989 - 2¹¹ = 17946941 is a prime.

It is a super-2 number, since 2×17948989² = 644332412244242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17948389) 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, 8847 + ... + 10684.

It is an arithmetic number, because the mean of its divisors is an integer number (4492360).

Almost surely, 2^17948989 is an apocalyptic number.

It is an amenable number.

17948989 is a deficient number, since it is larger than the sum of its proper divisors (20451).

17948989 is an equidigital number, since it uses as much as digits as its factorization.

17948989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20450.

The product of its digits is 1306368, while the sum is 55.

The square root of 17948989 is about 4236.6247178621. The cubic root of 17948989 is about 261.8263373370.

The spelling of 17948989 in words is "seventeen million, nine hundred forty-eight thousand, nine hundred eighty-nine".