16989870 has 32 divisors (see below), whose sum is σ = 42550272. Its totient is φ = 4333472.

The previous prime is 16989827. The next prime is 16989883. The reversal of 16989870 is 7898961.

It is a happy number.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11622 + ... + 13001.

It is an arithmetic number, because the mean of its divisors is an integer number (1329696).

Almost surely, 2^16989870 is an apocalyptic number.

16989870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16989870 is an abundant number, since it is smaller than the sum of its proper divisors (25560402).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16989870 is a wasteful number, since it uses less digits than its factorization.

16989870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24656.

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 16989870 is about 4121.8769996204. The cubic root of 16989870 is about 257.0770762072.

Subtracting from 16989870 its reverse (7898961), we obtain a palindrome (9090909).

The spelling of 16989870 in words is "sixteen million, nine hundred eighty-nine thousand, eight hundred seventy".