1664546 has 16 divisors (see below), whose sum is σ = 2728824. Its totient is φ = 756864.

The previous prime is 1664543. The next prime is 1664549. The reversal of 1664546 is 6454661.

It is an interprime number because it is at equal distance from previous prime (1664543) and next prime (1664549).

It can be written as a sum of positive squares in 4 ways, for example, as 1452025 + 212521 = 1205^2 + 461^2 .

It is a super-2 number, since 2×1664546² = 5541426772232, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1664543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1460 + ... + 2336.

2^1664546 is an apocalyptic number.

1664546 is a deficient number, since it is larger than the sum of its proper divisors (1064278).

1664546 is a wasteful number, since it uses less digits than its factorization.

1664546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965.

The product of its digits is 17280, while the sum is 32.

The square root of 1664546 is about 1290.1728566359. The cubic root of 1664546 is about 118.5128022393.

The spelling of 1664546 in words is "one million, six hundred sixty-four thousand, five hundred forty-six".