16624397 has 2 divisors, whose sum is σ = 16624398. Its totient is φ = 16624396.

The previous prime is 16624381. The next prime is 16624409. The reversal of 16624397 is 79342661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15217801 + 1406596 = 3901^2 + 1186^2 .

It is an emirp because it is prime and its reverse (79342661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16624397 - 2⁴ = 16624381 is a prime.

It is a super-2 number, since 2×16624397² = 552741151227218, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16624397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16624327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8312198 + 8312199.

It is an arithmetic number, because the mean of its divisors is an integer number (8312199).

Almost surely, 2^16624397 is an apocalyptic number.

It is an amenable number.

16624397 is a deficient number, since it is larger than the sum of its proper divisors (1).

16624397 is an equidigital number, since it uses as much as digits as its factorization.

16624397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 38.

The square root of 16624397 is about 4077.3026623002. The cubic root of 16624397 is about 255.2203503539.

The spelling of 16624397 in words is "sixteen million, six hundred twenty-four thousand, three hundred ninety-seven".