16623401 has 2 divisors, whose sum is σ = 16623402. Its totient is φ = 16623400.

The previous prime is 16623391. The next prime is 16623403. The reversal of 16623401 is 10432661.

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., 10368400 + 6255001 = 3220^2 + 2501^2 .

It is a cyclic number.

It is not a de Polignac number, because 16623401 - 2⁶ = 16623337 is a prime.

Together with 16623403, it forms a pair of twin primes.

It is a Chen prime.

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, 8311700 + 8311701.

It is an arithmetic number, because the mean of its divisors is an integer number (8311701).

Almost surely, 2^16623401 is an apocalyptic number.

It is an amenable number.

16623401 is a deficient number, since it is larger than the sum of its proper divisors (1).

16623401 is an equidigital number, since it uses as much as digits as its factorization.

16623401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 16623401 is about 4077.1805208992. The cubic root of 16623401 is about 255.2152533360.

The spelling of 16623401 in words is "sixteen million, six hundred twenty-three thousand, four hundred one".