1664434 has 4 divisors (see below), whose sum is σ = 2496654. Its totient is φ = 832216.

The previous prime is 1664431. The next prime is 1664437. The reversal of 1664434 is 4344661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4344661 = 157 ⋅27673.

It is an interprime number because it is at equal distance from previous prime (1664431) and next prime (1664437).

It can be written as a sum of positive squares in only one way, i.e., 1625625 + 38809 = 1275^2 + 197^2 .

It is a d-powerful number, because it can be written as 1 + 6 + 6³ + 4⁴ + 4⁶ + 3¹³ + 4⁸ .

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 as a sum of consecutive naturals, namely, 416107 + ... + 416110.

2^1664434 is an apocalyptic number.

1664434 is a deficient number, since it is larger than the sum of its proper divisors (832220).

1664434 is an equidigital number, since it uses as much as digits as its factorization.

1664434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832219.

The product of its digits is 6912, while the sum is 28.

The square root of 1664434 is about 1290.1294508692. The cubic root of 1664434 is about 118.5101441107.

The spelling of 1664434 in words is "one million, six hundred sixty-four thousand, four hundred thirty-four".