16390605 has 64 divisors (see below), whose sum is σ = 34172928. Its totient is φ = 6504960.

The previous prime is 16390573. The next prime is 16390607. The reversal of 16390605 is 50609361.

It is a happy number.

It is not a de Polignac number, because 16390605 - 2⁵ = 16390573 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16390607) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26257 + ... + 26873.

It is an arithmetic number, because the mean of its divisors is an integer number (533952).

Almost surely, 2^16390605 is an apocalyptic number.

16390605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16390605 is an abundant number, since it is smaller than the sum of its proper divisors (17782323).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16390605 is a wasteful number, since it uses less digits than its factorization.

16390605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 16390605 is about 4048.5312151446. The cubic root of 16390605 is about 254.0182938856.

Adding to 16390605 its reverse (50609361), we get a palindrome (66999966).

The spelling of 16390605 in words is "sixteen million, three hundred ninety thousand, six hundred five".