16405601 has 4 divisors (see below), whose sum is σ = 17118912. Its totient is φ = 15692292.

The previous prime is 16405591. The next prime is 16405621. The reversal of 16405601 is 10650461.

16405601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-16405601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 713287 = 16405601 / (1 + 6 + 4 + 0 + 5 + 6 + 0 + 1).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16405621) 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, 356621 + ... + 356666.

It is an arithmetic number, because the mean of its divisors is an integer number (4279728).

Almost surely, 2^16405601 is an apocalyptic number.

It is an amenable number.

16405601 is a deficient number, since it is larger than the sum of its proper divisors (713311).

16405601 is an equidigital number, since it uses as much as digits as its factorization.

16405601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713310.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 16405601 is about 4050.3828214133. The cubic root of 16405601 is about 254.0957386009.

The spelling of 16405601 in words is "sixteen million, four hundred five thousand, six hundred one".