16809970 has 16 divisors (see below), whose sum is σ = 30319128. Its totient is φ = 6710400.

The previous prime is 16809943. The next prime is 16809971. The reversal of 16809970 is 7990861.

It can be written as a sum of positive squares in 4 ways, for example, as 16426809 + 383161 = 4053^2 + 619^2 .

It is not an unprimeable number, because it can be changed into a prime (16809971) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4612 + ... + 7408.

Almost surely, 2^16809970 is an apocalyptic number.

16809970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16809970 is a deficient number, since it is larger than the sum of its proper divisors (13509158).

16809970 is a wasteful number, since it uses less digits than its factorization.

16809970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3405.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 16809970 is about 4099.9963414618. The cubic root of 16809970 is about 256.1664871622.

The spelling of 16809970 in words is "sixteen million, eight hundred nine thousand, nine hundred seventy".