16623403 has 2 divisors, whose sum is σ = 16623404. Its totient is φ = 16623402.

The previous prime is 16623401. The next prime is 16623407. The reversal of 16623403 is 30432661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16623403 - 2¹ = 16623401 is a prime.

Together with 16623401, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16623401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8311701 + 8311702.

It is an arithmetic number, because the mean of its divisors is an integer number (8311702).

Almost surely, 2^16623403 is an apocalyptic number.

16623403 is a deficient number, since it is larger than the sum of its proper divisors (1).

16623403 is an equidigital number, since it uses as much as digits as its factorization.

16623403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 16623403 is about 4077.1807661667. The cubic root of 16623403 is about 255.2152635712.

The spelling of 16623403 in words is "sixteen million, six hundred twenty-three thousand, four hundred three".