1099915 has 4 divisors (see below), whose sum is σ = 1319904. Its totient is φ = 879928.

The previous prime is 1099867. The next prime is 1099927. The reversal of 1099915 is 5199901.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1099915 - 2¹⁵ = 1067147 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109987 + ... + 109996.

It is an arithmetic number, because the mean of its divisors is an integer number (329976).

2^1099915 is an apocalyptic number.

1099915 is a deficient number, since it is larger than the sum of its proper divisors (219989).

1099915 is an equidigital number, since it uses as much as digits as its factorization.

1099915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219988.

The product of its (nonzero) digits is 3645, while the sum is 34.

The square root of 1099915 is about 1048.7683252273. The cubic root of 1099915 is about 103.2253525738.

The spelling of 1099915 in words is "one million, ninety-nine thousand, nine hundred fifteen".