1664234 has 36 divisors (see below), whose sum is σ = 3089058. Its totient is φ = 667920.

The previous prime is 1664227. The next prime is 1664251. The reversal of 1664234 is 4324661.

It can be written as a sum of positive squares in only one way, i.e., 1600225 + 64009 = 1265^2 + 253^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a d-powerful number, because it can be written as 1 + 6 + 6⁴ + 4⁵ + 2¹¹ + 3¹³ + 4⁸ .

It is a Curzon number.

It is an unprimeable number.

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 in 17 ways as a sum of consecutive naturals, for example, 72347 + ... + 72369.

2^1664234 is an apocalyptic number.

1664234 is a deficient number, since it is larger than the sum of its proper divisors (1424824).

1664234 is a wasteful number, since it uses less digits than its factorization.

1664234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83 (or 49 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

The square root of 1664234 is about 1290.0519369390. The cubic root of 1664234 is about 118.5053971561.

Multiplying 1664234 by its sum of digits (26), we get a square (43270084 = 6578²).

1664234 divided by its sum of digits (26) gives a square (64009 = 253²).

Adding to 1664234 its reverse (4324661), we get a palindrome (5988895).

It can be divided in two parts, 1664 and 234, that multiplied together give a square (389376 = 624²).

The spelling of 1664234 in words is "one million, six hundred sixty-four thousand, two hundred thirty-four".