1664441 has 4 divisors (see below), whose sum is σ = 1736832. Its totient is φ = 1592052.

The previous prime is 1664437. The next prime is 1664447. The reversal of 1664441 is 1444661.

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 1664441 - 2² = 1664437 is a prime.

It is a super-3 number, since 3×1664441³ = 13833321493028754363, which contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1664441.

It is not an unprimeable number, because it can be changed into a prime (1664447) 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, 36161 + ... + 36206.

It is an arithmetic number, because the mean of its divisors is an integer number (434208).

2^1664441 is an apocalyptic number.

It is an amenable number.

1664441 is a deficient number, since it is larger than the sum of its proper divisors (72391).

1664441 is an equidigital number, since it uses as much as digits as its factorization.

1664441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72390.

The product of its digits is 2304, while the sum is 26.

The square root of 1664441 is about 1290.1321637724. The cubic root of 1664441 is about 118.5103102473.

The spelling of 1664441 in words is "one million, six hundred sixty-four thousand, four hundred forty-one".