1664135 has 16 divisors (see below), whose sum is σ = 2211840. Its totient is φ = 1191840.

The previous prime is 1664123. The next prime is 1664227. The reversal of 1664135 is 5314661.

It is not a de Polignac number, because 1664135 - 2⁶ = 1664071 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4154 + ... + 4536.

It is an arithmetic number, because the mean of its divisors is an integer number (138240).

2^1664135 is an apocalyptic number.

1664135 is a deficient number, since it is larger than the sum of its proper divisors (547705).

1664135 is a wasteful number, since it uses less digits than its factorization.

1664135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478.

The product of its digits is 2160, while the sum is 26.

The square root of 1664135 is about 1290.0135658201. The cubic root of 1664135 is about 118.5030472728.

Adding to 1664135 its reverse (5314661), we get a palindrome (6978796).

The spelling of 1664135 in words is "one million, six hundred sixty-four thousand, one hundred thirty-five".