16390001 has 4 divisors (see below), whose sum is σ = 16833012. Its totient is φ = 15946992.

The previous prime is 16389991. The next prime is 16390013. The reversal of 16390001 is 10009361.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6630625 + 9759376 = 2575^2 + 3124^2 .

It is a cyclic number.

It is not a de Polignac number, because 16390001 - 2⁶ = 16389937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16390021) 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, 221450 + ... + 221523.

It is an arithmetic number, because the mean of its divisors is an integer number (4208253).

Almost surely, 2^16390001 is an apocalyptic number.

It is an amenable number.

16390001 is a deficient number, since it is larger than the sum of its proper divisors (443011).

16390001 is an equidigital number, since it uses as much as digits as its factorization.

16390001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443010.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 16390001 is about 4048.4566195033. The cubic root of 16390001 is about 254.0151736239.

Adding to 16390001 its reverse (10009361), we get a palindrome (26399362).

The spelling of 16390001 in words is "sixteen million, three hundred ninety thousand, one".