17990969 has 2 divisors, whose sum is σ = 17990970. Its totient is φ = 17990968.

The previous prime is 17990957. The next prime is 17990983. The reversal of 17990969 is 96909971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14137600 + 3853369 = 3760^2 + 1963^2 .

It is a cyclic number.

It is not a de Polignac number, because 17990969 - 2⁴ = 17990953 is a prime.

It is a super-2 number, since 2×17990969² = 647349931117922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (17990939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8995484 + 8995485.

It is an arithmetic number, because the mean of its divisors is an integer number (8995485).

Almost surely, 2^17990969 is an apocalyptic number.

It is an amenable number.

17990969 is a deficient number, since it is larger than the sum of its proper divisors (1).

17990969 is an equidigital number, since it uses as much as digits as its factorization.

17990969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 275562, while the sum is 50.

The square root of 17990969 is about 4241.5762400315. The cubic root of 17990969 is about 262.0303026156.

The spelling of 17990969 in words is "seventeen million, nine hundred ninety thousand, nine hundred sixty-nine".