16723409 has 2 divisors, whose sum is σ = 16723410. Its totient is φ = 16723408.

The previous prime is 16723397. The next prime is 16723423. The reversal of 16723409 is 90432761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12229009 + 4494400 = 3497^2 + 2120^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16723409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16723489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8361704 + 8361705.

It is an arithmetic number, because the mean of its divisors is an integer number (8361705).

Almost surely, 2^16723409 is an apocalyptic number.

It is an amenable number.

16723409 is a deficient number, since it is larger than the sum of its proper divisors (1).

16723409 is an equidigital number, since it uses as much as digits as its factorization.

16723409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 16723409 is about 4089.4264879076. The cubic root of 16723409 is about 255.7260303496.

The spelling of 16723409 in words is "sixteen million, seven hundred twenty-three thousand, four hundred nine".