16989745 has 8 divisors (see below), whose sum is σ = 20510784. Its totient is φ = 13509744.

The previous prime is 16989727. The next prime is 16989757. The reversal of 16989745 is 54798961.

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 16989745 - 2¹³ = 16981553 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9339 + ... + 11008.

It is an arithmetic number, because the mean of its divisors is an integer number (2563848).

Almost surely, 2^16989745 is an apocalyptic number.

It is an amenable number.

16989745 is a deficient number, since it is larger than the sum of its proper divisors (3521039).

16989745 is a wasteful number, since it uses less digits than its factorization.

16989745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20519.

The product of its digits is 544320, while the sum is 49.

The square root of 16989745 is about 4121.8618365976. The cubic root of 16989745 is about 257.0764457391.

The spelling of 16989745 in words is "sixteen million, nine hundred eighty-nine thousand, seven hundred forty-five".