16623493 has 2 divisors, whose sum is σ = 16623494. Its totient is φ = 16623492.

The previous prime is 16623469. The next prime is 16623511. The reversal of 16623493 is 39432661.

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., 16136289 + 487204 = 4017^2 + 698^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16623493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16623403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8311746 + 8311747.

It is an arithmetic number, because the mean of its divisors is an integer number (8311747).

Almost surely, 2^16623493 is an apocalyptic number.

It is an amenable number.

16623493 is a deficient number, since it is larger than the sum of its proper divisors (1).

16623493 is an equidigital number, since it uses as much as digits as its factorization.

16623493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 34.

The square root of 16623493 is about 4077.1918031900. The cubic root of 16623493 is about 255.2157241534.

The spelling of 16623493 in words is "sixteen million, six hundred twenty-three thousand, four hundred ninety-three".