16840047 has 32 divisors (see below), whose sum is σ = 27827712. Its totient is φ = 8838144.

The previous prime is 16840009. The next prime is 16840067. The reversal of 16840047 is 74004861.

It is not a de Polignac number, because 16840047 - 2¹⁵ = 16807279 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16839996 and 16840023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16840067) 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 31 ways as a sum of consecutive naturals, for example, 14803 + ... + 15899.

It is an arithmetic number, because the mean of its divisors is an integer number (869616).

Almost surely, 2^16840047 is an apocalyptic number.

16840047 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

16840047 is a deficient number, since it is larger than the sum of its proper divisors (10987665).

16840047 is a wasteful number, since it uses less digits than its factorization.

16840047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 16840047 is about 4103.6626323322. The cubic root of 16840047 is about 256.3191768816.

The spelling of 16840047 in words is "sixteen million, eight hundred forty thousand, forty-seven".