16400047 has 2 divisors, whose sum is σ = 16400048. Its totient is φ = 16400046.

The previous prime is 16400017. The next prime is 16400093. The reversal of 16400047 is 74000461.

It is a weak prime.

It is an emirp because it is prime and its reverse (74000461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16400047 - 2¹¹ = 16397999 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16400017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8200023 + 8200024.

It is an arithmetic number, because the mean of its divisors is an integer number (8200024).

Almost surely, 2^16400047 is an apocalyptic number.

16400047 is a deficient number, since it is larger than the sum of its proper divisors (1).

16400047 is an equidigital number, since it uses as much as digits as its factorization.

16400047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 16400047 is about 4049.6971491705. The cubic root of 16400047 is about 254.0670612604.

The spelling of 16400047 in words is "sixteen million, four hundred thousand, forty-seven".