16849640 has 16 divisors (see below), whose sum is σ = 37911780. Its totient is φ = 6739840.

The previous prime is 16849631. The next prime is 16849687. The reversal of 16849640 is 4694861.

It can be written as a sum of positive squares in 2 ways, for example, as 16760836 + 88804 = 4094^2 + 298^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16849594 and 16849603.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210581 + ... + 210660.

Almost surely, 2^16849640 is an apocalyptic number.

16849640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16849640 is an abundant number, since it is smaller than the sum of its proper divisors (21062140).

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

16849640 is a wasteful number, since it uses less digits than its factorization.

16849640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421252 (or 421248 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 16849640 is about 4104.8312998222. The cubic root of 16849640 is about 256.3678387234.

The spelling of 16849640 in words is "sixteen million, eight hundred forty-nine thousand, six hundred forty".