16723997 has 2 divisors, whose sum is σ = 16723998. Its totient is φ = 16723996.

The previous prime is 16723957. The next prime is 16724003. The reversal of 16723997 is 79932761.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10896601 + 5827396 = 3301^2 + 2414^2 .

It is an emirp because it is prime and its reverse (79932761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16723997 - 2¹⁶ = 16658461 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 (16723957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8361998 + 8361999.

It is an arithmetic number, because the mean of its divisors is an integer number (8361999).

Almost surely, 2^16723997 is an apocalyptic number.

It is an amenable number.

16723997 is a deficient number, since it is larger than the sum of its proper divisors (1).

16723997 is an equidigital number, since it uses as much as digits as its factorization.

16723997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 142884, while the sum is 44.

The square root of 16723997 is about 4089.4983799972. The cubic root of 16723997 is about 255.7290274487.

The spelling of 16723997 in words is "sixteen million, seven hundred twenty-three thousand, nine hundred ninety-seven".