16809456 has 40 divisors (see below), whose sum is σ = 44354304. Its totient is φ = 5483200.

The previous prime is 16809451. The next prime is 16809461. The reversal of 16809456 is 65490861.

It is an interprime number because it is at equal distance from previous prime (16809451) and next prime (16809461).

It is a super-2 number, since 2×16809456² = 565115622031872, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16809451) by changing a digit.

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, 1470 + ... + 5981.

Almost surely, 2^16809456 is an apocalyptic number.

16809456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16809456 is an abundant number, since it is smaller than the sum of its proper divisors (27544848).

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

16809456 is a wasteful number, since it uses less digits than its factorization.

16809456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7509 (or 7503 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 16809456 is about 4099.9336579998. The cubic root of 16809456 is about 256.1638761935.

The spelling of 16809456 in words is "sixteen million, eight hundred nine thousand, four hundred fifty-six".