1155664 has 10 divisors (see below), whose sum is σ = 2239130. Its totient is φ = 577824.

The previous prime is 1155659. The next prime is 1155689. The reversal of 1155664 is 4665511.

1155664 = T₁₉₅ + T₁₉₆ + ... + T₂₄₂.

It can be written as a sum of positive squares in only one way, i.e., 795664 + 360000 = 892^2 + 600^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36099 + ... + 36130.

It is an arithmetic number, because the mean of its divisors is an integer number (223913).

2^1155664 is an apocalyptic number.

It is an amenable number.

1155664 is a deficient number, since it is larger than the sum of its proper divisors (1083466).

1155664 is an equidigital number, since it uses as much as digits as its factorization.

1155664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72237 (or 72231 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 1155664 is about 1075.0181393818. The cubic root of 1155664 is about 104.9406769964.

It can be divided in two parts, 115566 and 4, that multiplied together give a palindrome (462264).

The spelling of 1155664 in words is "one million, one hundred fifty-five thousand, six hundred sixty-four".