16439791 has 2 divisors, whose sum is σ = 16439792. Its totient is φ = 16439790.

The previous prime is 16439767. The next prime is 16439809. The reversal of 16439791 is 19793461.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16439791 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 (16419791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8219895 + 8219896.

It is an arithmetic number, because the mean of its divisors is an integer number (8219896).

Almost surely, 2^16439791 is an apocalyptic number.

16439791 is a deficient number, since it is larger than the sum of its proper divisors (1).

16439791 is an equidigital number, since it uses as much as digits as its factorization.

16439791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 40.

The square root of 16439791 is about 4054.6012134364. The cubic root of 16439791 is about 254.2721317163.

The spelling of 16439791 in words is "sixteen million, four hundred thirty-nine thousand, seven hundred ninety-one".