1099864 has 8 divisors (see below), whose sum is σ = 2062260. Its totient is φ = 549928.

The previous prime is 1099859. The next prime is 1099867. The reversal of 1099864 is 4689901.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1099867) by changing a digit.

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, 68734 + ... + 68749.

2^1099864 is an apocalyptic number.

It is an amenable number.

1099864 is a deficient number, since it is larger than the sum of its proper divisors (962396).

1099864 is a wasteful number, since it uses less digits than its factorization.

1099864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137489 (or 137485 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 1099864 is about 1048.7440107100. The cubic root of 1099864 is about 103.2237571250.

Adding to 1099864 its sum of digits (37), we get a palindrome (1099901).

The spelling of 1099864 in words is "one million, ninety-nine thousand, eight hundred sixty-four".