16621703 has 4 divisors (see below), whose sum is σ = 18996240. Its totient is φ = 14247168.

The previous prime is 16621681. The next prime is 16621721. The reversal of 16621703 is 30712661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16621703 - 2²⁰ = 15573127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16621723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1187258 + ... + 1187271.

It is an arithmetic number, because the mean of its divisors is an integer number (4749060).

Almost surely, 2^16621703 is an apocalyptic number.

16621703 is a deficient number, since it is larger than the sum of its proper divisors (2374537).

16621703 is an equidigital number, since it uses as much as digits as its factorization.

16621703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2374536.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 16621703 is about 4076.9722834476. The cubic root of 16621703 is about 255.2065633722.

The spelling of 16621703 in words is "sixteen million, six hundred twenty-one thousand, seven hundred three".