16840043 has 4 divisors (see below), whose sum is σ = 18370968. Its totient is φ = 15309120.

The previous prime is 16840009. The next prime is 16840067. The reversal of 16840043 is 34004861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16840043 - 2¹² = 16835947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16839994 and 16840021.

It is not an unprimeable number, because it can be changed into a prime (16840093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 765446 + ... + 765467.

It is an arithmetic number, because the mean of its divisors is an integer number (4592742).

Almost surely, 2^16840043 is an apocalyptic number.

16840043 is a deficient number, since it is larger than the sum of its proper divisors (1530925).

16840043 is a wasteful number, since it uses less digits than its factorization.

16840043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1530924.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 16840043 is about 4103.6621449627. The cubic root of 16840043 is about 256.3191565872.

The spelling of 16840043 in words is "sixteen million, eight hundred forty thousand, forty-three".