1664338 has 8 divisors (see below), whose sum is σ = 2688588. Its totient is φ = 768144.

The previous prime is 1664291. The next prime is 1664353. The reversal of 1664338 is 8334661.

It can be written as a sum of positive squares in 2 ways, for example, as 1605289 + 59049 = 1267^2 + 243^2 .

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

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31981 + ... + 32032.

2^1664338 is an apocalyptic number.

1664338 is a deficient number, since it is larger than the sum of its proper divisors (1024250).

1664338 is a wasteful number, since it uses less digits than its factorization.

1664338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64028.

The product of its digits is 10368, while the sum is 31.

The square root of 1664338 is about 1290.0922447639. The cubic root of 1664338 is about 118.5078656200.

Adding to 1664338 its reverse (8334661), we get a palindrome (9998999).

It can be divided in two parts, 1664 and 338, that added together give a palindrome (2002).

The spelling of 1664338 in words is "one million, six hundred sixty-four thousand, three hundred thirty-eight".