1664244 has 18 divisors (see below), whose sum is σ = 4206930. Its totient is φ = 554736.

The previous prime is 1664227. The next prime is 1664251. The reversal of 1664244 is 4424661.

1664244 is a `hidden beast` number, since 16 + 642 + 4 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1664100 + 144 = 1290^2 + 12^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23079 + ... + 23150.

2^1664244 is an apocalyptic number.

It is an amenable number.

1664244 is an abundant number, since it is smaller than the sum of its proper divisors (2542686).

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

1664244 is a wasteful number, since it uses less digits than its factorization.

1664244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46239 (or 46234 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 1664244 is about 1290.0558127461. The cubic root of 1664244 is about 118.5056345128.

The spelling of 1664244 in words is "one million, six hundred sixty-four thousand, two hundred forty-four".