16623949 has 2 divisors, whose sum is σ = 16623950. Its totient is φ = 16623948.

The previous prime is 16623913. The next prime is 16623961. The reversal of 16623949 is 94932661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16564900 + 59049 = 4070^2 + 243^2 .

It is a cyclic number.

It is not a de Polignac number, because 16623949 - 2¹⁵ = 16591181 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 (16623449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8311974 + 8311975.

It is an arithmetic number, because the mean of its divisors is an integer number (8311975).

Almost surely, 2^16623949 is an apocalyptic number.

It is an amenable number.

16623949 is a deficient number, since it is larger than the sum of its proper divisors (1).

16623949 is an equidigital number, since it uses as much as digits as its factorization.

16623949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 40.

The square root of 16623949 is about 4077.2477236489. The cubic root of 16623949 is about 255.2180577445.

The spelling of 16623949 in words is "sixteen million, six hundred twenty-three thousand, nine hundred forty-nine".