16438729 has 2 divisors, whose sum is σ = 16438730. Its totient is φ = 16438728.

The previous prime is 16438717. The next prime is 16438733. The reversal of 16438729 is 92783461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12616704 + 3822025 = 3552^2 + 1955^2 .

It is an emirp because it is prime and its reverse (92783461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16438729 - 2⁹ = 16438217 is a prime.

It is a super-2 number, since 2×16438729² = 540463622270882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16438691 and 16438700.

It is not a weakly prime, because it can be changed into another prime (16438739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8219364 + 8219365.

It is an arithmetic number, because the mean of its divisors is an integer number (8219365).

Almost surely, 2^16438729 is an apocalyptic number.

It is an amenable number.

16438729 is a deficient number, since it is larger than the sum of its proper divisors (1).

16438729 is an equidigital number, since it uses as much as digits as its factorization.

16438729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 40.

The square root of 16438729 is about 4054.4702489968. The cubic root of 16438729 is about 254.2666563259.

The spelling of 16438729 in words is "sixteen million, four hundred thirty-eight thousand, seven hundred twenty-nine".