1664026 has 32 divisors (see below), whose sum is σ = 3161088. Its totient is φ = 639360.

The previous prime is 1664021. The next prime is 1664053. The reversal of 1664026 is 6204661.

It is a happy number.

It is a Smith number, since the sum of its digits (25) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1664021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7351 + ... + 7573.

It is an arithmetic number, because the mean of its divisors is an integer number (98784).

2^1664026 is an apocalyptic number.

1664026 is a deficient number, since it is larger than the sum of its proper divisors (1497062).

1664026 is a wasteful number, since it uses less digits than its factorization.

1664026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 1664026 is about 1289.9713175106. The cubic root of 1664026 is about 118.5004599198.

Adding to 1664026 its reverse (6204661), we get a palindrome (7868687).

The spelling of 1664026 in words is "one million, six hundred sixty-four thousand, twenty-six".