16444001 has 4 divisors (see below), whose sum is σ = 18793152. Its totient is φ = 14094852.

The previous prime is 16443997. The next prime is 16444003. The reversal of 16444001 is 10044461.

It is a happy number.

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 16444001 - 2² = 16443997 is a prime.

It is a super-3 number, since 3×16444001³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (16444003) 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, 1174565 + ... + 1174578.

It is an arithmetic number, because the mean of its divisors is an integer number (4698288).

Almost surely, 2^16444001 is an apocalyptic number.

It is an amenable number.

16444001 is a deficient number, since it is larger than the sum of its proper divisors (2349151).

16444001 is an equidigital number, since it uses as much as digits as its factorization.

16444001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2349150.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 16444001 is about 4055.1203434670. The cubic root of 16444001 is about 254.2938350398.

Adding to 16444001 its reverse (10044461), we get a palindrome (26488462).

The spelling of 16444001 in words is "sixteen million, four hundred forty-four thousand, one".