16840681 has 12 divisors (see below), whose sum is σ = 19895760. Its totient is φ = 14130480.

The previous prime is 16840633. The next prime is 16840721. The reversal of 16840681 is 18604861.

It is not a de Polignac number, because 16840681 - 2¹³ = 16832489 is a prime.

It is a super-2 number, since 2×16840681² = 567217073087522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16840981) 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 11 ways as a sum of consecutive naturals, for example, 2671 + ... + 6388.

It is an arithmetic number, because the mean of its divisors is an integer number (1657980).

Almost surely, 2^16840681 is an apocalyptic number.

16840681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16840681 is a deficient number, since it is larger than the sum of its proper divisors (3055079).

16840681 is a wasteful number, since it uses less digits than its factorization.

16840681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9096 (or 9083 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 16840681 is about 4103.7398796707. The cubic root of 16840681 is about 256.3223935060.

The spelling of 16840681 in words is "sixteen million, eight hundred forty thousand, six hundred eighty-one".