16969999 has 4 divisors (see below), whose sum is σ = 16986160. Its totient is φ = 16953840.

The previous prime is 16969991. The next prime is 16970003. The reversal of 16969999 is 99996961.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99996961 = 307 ⋅325723.

It is a cyclic number.

It is not a de Polignac number, because 16969999 - 2³ = 16969991 is a prime.

It is a Duffinian number.

16969999 is a modest number, since divided by 9999 gives 1696 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16969991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6387 + ... + 8644.

It is an arithmetic number, because the mean of its divisors is an integer number (4246540).

Almost surely, 2^16969999 is an apocalyptic number.

16969999 is a deficient number, since it is larger than the sum of its proper divisors (16161).

16969999 is a wasteful number, since it uses less digits than its factorization.

16969999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16160.

The product of its digits is 2125764, while the sum is 58.

The square root of 16969999 is about 4119.4658634342. The cubic root of 16969999 is about 256.9768131009.

The spelling of 16969999 in words is "sixteen million, nine hundred sixty-nine thousand, nine hundred ninety-nine".