16609840 has 40 divisors (see below), whose sum is σ = 41591088. Its totient is φ = 6132480.

The previous prime is 16609823. The next prime is 16609843. The reversal of 16609840 is 4890661.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 16609796 and 16609805.

It is not an unprimeable number, because it can be changed into a prime (16609843) 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, 6946 + ... + 9025.

Almost surely, 2^16609840 is an apocalyptic number.

16609840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16609840 is an abundant number, since it is smaller than the sum of its proper divisors (24981248).

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

16609840 is a wasteful number, since it uses less digits than its factorization.

16609840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15997 (or 15991 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 16609840 is about 4075.5171450995. The cubic root of 16609840 is about 255.1458348176.

The spelling of 16609840 in words is "sixteen million, six hundred nine thousand, eight hundred forty".