16604407 has 4 divisors (see below), whose sum is σ = 16990600. Its totient is φ = 16218216.

The previous prime is 16604389. The next prime is 16604417. The reversal of 16604407 is 70440661.

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 16604407 - 2¹¹ = 16602359 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 (16604417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193032 + ... + 193117.

It is an arithmetic number, because the mean of its divisors is an integer number (4247650).

Almost surely, 2^16604407 is an apocalyptic number.

16604407 is a deficient number, since it is larger than the sum of its proper divisors (386193).

16604407 is an equidigital number, since it uses as much as digits as its factorization.

16604407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386192.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 16604407 is about 4074.8505494067. The cubic root of 16604407 is about 255.1180127858.

The spelling of 16604407 in words is "sixteen million, six hundred four thousand, four hundred seven".