16989442 has 4 divisors (see below), whose sum is σ = 25484166. Its totient is φ = 8494720.

The previous prime is 16989421. The next prime is 16989461. The reversal of 16989442 is 24498961.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 9865881 + 7123561 = 3141^2 + 2669^2 .

It is a super-2 number, since 2×16989442² = 577282278942728, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4247359 + ... + 4247362.

Almost surely, 2^16989442 is an apocalyptic number.

16989442 is a deficient number, since it is larger than the sum of its proper divisors (8494724).

16989442 is an equidigital number, since it uses as much as digits as its factorization.

16989442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8494723.

The product of its digits is 124416, while the sum is 43.

The square root of 16989442 is about 4121.8250811989. The cubic root of 16989442 is about 257.0749174716.

The spelling of 16989442 in words is "sixteen million, nine hundred eighty-nine thousand, four hundred forty-two".