16781043 has 4 divisors (see below), whose sum is σ = 22374728. Its totient is φ = 11187360.

The previous prime is 16781033. The next prime is 16781059. The reversal of 16781043 is 34018761.

It is a happy number.

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

It is not a de Polignac number, because 16781043 - 2⁶ = 16780979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16781043.

It is not an unprimeable number, because it can be changed into a prime (16781033) 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, 2796838 + ... + 2796843.

It is an arithmetic number, because the mean of its divisors is an integer number (5593682).

Almost surely, 2^16781043 is an apocalyptic number.

16781043 is a deficient number, since it is larger than the sum of its proper divisors (5593685).

16781043 is an equidigital number, since it uses as much as digits as its factorization.

16781043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5593684.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 16781043 is about 4096.4671364482. The cubic root of 16781043 is about 256.0194636487.

The spelling of 16781043 in words is "sixteen million, seven hundred eighty-one thousand, forty-three".