16906989 has 8 divisors (see below), whose sum is σ = 24592032. Its totient is φ = 10246640.

The previous prime is 16906973. The next prime is 16907057. The reversal of 16906989 is 98960961.

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 16906989 - 2⁴ = 16906973 is a prime.

It is a super-2 number, since 2×16906989² = 571692554092242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16906949) 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, 256134 + ... + 256199.

It is an arithmetic number, because the mean of its divisors is an integer number (3074004).

Almost surely, 2^16906989 is an apocalyptic number.

It is an amenable number.

16906989 is a deficient number, since it is larger than the sum of its proper divisors (7685043).

16906989 is a wasteful number, since it uses less digits than its factorization.

16906989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512347.

The product of its (nonzero) digits is 209952, while the sum is 48.

The square root of 16906989 is about 4111.8109149133. The cubic root of 16906989 is about 256.6583650170.

The spelling of 16906989 in words is "sixteen million, nine hundred six thousand, nine hundred eighty-nine".