1664045 has 8 divisors (see below), whose sum is σ = 2114424. Its totient is φ = 1252864.

The previous prime is 1664021. The next prime is 1664053. The reversal of 1664045 is 5404661.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 769129 + 894916 = 877^2 + 946^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1664045 - 2⁸ = 1663789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9704 + ... + 9873.

It is an arithmetic number, because the mean of its divisors is an integer number (264303).

2^1664045 is an apocalyptic number.

It is an amenable number.

1664045 is a deficient number, since it is larger than the sum of its proper divisors (450379).

1664045 is a wasteful number, since it uses less digits than its factorization.

1664045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19599.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 1664045 is about 1289.9786819944. The cubic root of 1664045 is about 118.5009109344.

The spelling of 1664045 in words is "one million, six hundred sixty-four thousand, forty-five".