1664433 has 12 divisors (see below), whose sum is σ = 2420340. Its totient is φ = 1102176.

The previous prime is 1664431. The next prime is 1664437. The reversal of 1664433 is 3344661.

1664433 is a `hidden beast` number, since 16 + 644 + 3 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1192464 + 471969 = 1092^2 + 687^2 .

It is not a de Polignac number, because 1664433 - 2¹ = 1664431 is a prime.

It is a super-2 number, since 2×1664433² = 5540674422978, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1664397 and 1664406.

It is not an unprimeable number, because it can be changed into a prime (1664431) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1023 + ... + 2091.

It is an arithmetic number, because the mean of its divisors is an integer number (201695).

2^1664433 is an apocalyptic number.

It is an amenable number.

1664433 is a deficient number, since it is larger than the sum of its proper divisors (755907).

1664433 is a wasteful number, since it uses less digits than its factorization.

1664433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248 (or 1245 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

The square root of 1664433 is about 1290.1290633111. The cubic root of 1664433 is about 118.5101203769.

The spelling of 1664433 in words is "one million, six hundred sixty-four thousand, four hundred thirty-three".