16604401 has 4 divisors (see below), whose sum is σ = 18113904. Its totient is φ = 15094900.

The previous prime is 16604389. The next prime is 16604417. The reversal of 16604401 is 10440661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16604401 - 2⁹ = 16603889 is a prime.

It is a super-2 number, since 2×16604401² = 551412265137602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16604431) 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, 754735 + ... + 754756.

It is an arithmetic number, because the mean of its divisors is an integer number (4528476).

Almost surely, 2^16604401 is an apocalyptic number.

16604401 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16604401 is a deficient number, since it is larger than the sum of its proper divisors (1509503).

16604401 is a wasteful number, since it uses less digits than its factorization.

16604401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1509502.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 16604401 is about 4074.8498131833. The cubic root of 16604401 is about 255.1179820568.

The spelling of 16604401 in words is "sixteen million, six hundred four thousand, four hundred one".