17969999 has 2 divisors, whose sum is σ = 17970000. Its totient is φ = 17969998.

The previous prime is 17969981. The next prime is 17970011. The reversal of 17969999 is 99996971.

It is a strong prime.

It is an emirp because it is prime and its reverse (99996971) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17969999 - 2¹⁶ = 17904463 is a prime.

It is a Sophie Germain prime.

17969999 is a modest number, since divided by 9999 gives 1796 as remainder.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17965999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8984999 + 8985000.

It is an arithmetic number, because the mean of its divisors is an integer number (8985000).

Almost surely, 2^17969999 is an apocalyptic number.

17969999 is a deficient number, since it is larger than the sum of its proper divisors (1).

17969999 is an equidigital number, since it uses as much as digits as its factorization.

17969999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2480058, while the sum is 59.

The square root of 17969999 is about 4239.1035608959. The cubic root of 17969999 is about 261.9284568561.

The spelling of 17969999 in words is "seventeen million, nine hundred sixty-nine thousand, nine hundred ninety-nine".