16788989 has 8 divisors (see below), whose sum is σ = 20197440. Its totient is φ = 13633056.

The previous prime is 16788983. The next prime is 16788997. The reversal of 16788989 is 98988761.

It is a happy number.

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 16788989 - 2⁴ = 16788973 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16788983) 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, 62984 + ... + 63249.

It is an arithmetic number, because the mean of its divisors is an integer number (2524680).

Almost surely, 2^16788989 is an apocalyptic number.

16788989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

16788989 is a deficient number, since it is larger than the sum of its proper divisors (3408451).

16788989 is a wasteful number, since it uses less digits than its factorization.

16788989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126259.

The product of its digits is 1741824, while the sum is 56.

The square root of 16788989 is about 4097.4368817591. The cubic root of 16788989 is about 256.0598665734.

The spelling of 16788989 in words is "sixteen million, seven hundred eighty-eight thousand, nine hundred eighty-nine".