1664115 has 16 divisors (see below), whose sum is σ = 2803200. Its totient is φ = 840672.

The previous prime is 1664101. The next prime is 1664123. The reversal of 1664115 is 5114661.

It is not a de Polignac number, because 1664115 - 2⁵ = 1664083 is a prime.

1664115 is a lucky 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 15 ways as a sum of consecutive naturals, for example, 2635 + ... + 3204.

It is an arithmetic number, because the mean of its divisors is an integer number (175200).

2^1664115 is an apocalyptic number.

1664115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1664115 is a deficient number, since it is larger than the sum of its proper divisors (1139085).

1664115 is a wasteful number, since it uses less digits than its factorization.

1664115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5866.

The product of its digits is 720, while the sum is 24.

The square root of 1664115 is about 1290.0058139404. The cubic root of 1664115 is about 118.5025725376.

Adding to 1664115 its reverse (5114661), we get a palindrome (6778776).

The spelling of 1664115 in words is "one million, six hundred sixty-four thousand, one hundred fifteen".