1664734 has 4 divisors (see below), whose sum is σ = 2497104. Its totient is φ = 832366.

The previous prime is 1664713. The next prime is 1664771. The reversal of 1664734 is 4374661.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1664696 and 1664705.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 416182 + ... + 416185.

It is an arithmetic number, because the mean of its divisors is an integer number (624276).

2^1664734 is an apocalyptic number.

1664734 is a deficient number, since it is larger than the sum of its proper divisors (832370).

1664734 is an equidigital number, since it uses as much as digits as its factorization.

1664734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832369.

The product of its digits is 12096, while the sum is 31.

The square root of 1664734 is about 1290.2457130330. The cubic root of 1664734 is about 118.5172638298.

It can be divided in two parts, 166 and 4734, that added together give a square (4900 = 70²).

The spelling of 1664734 in words is "one million, six hundred sixty-four thousand, seven hundred thirty-four".