1099399 has 4 divisors (see below), whose sum is σ = 1256464. Its totient is φ = 942336.

The previous prime is 1099393. The next prime is 1099409. The reversal of 1099399 is 9939901.

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 1099399 - 2³ = 1099391 is a prime.

It is a super-2 number, since 2×1099399² = 2417356322402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1099391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78522 + ... + 78535.

It is an arithmetic number, because the mean of its divisors is an integer number (314116).

2^1099399 is an apocalyptic number.

1099399 is a deficient number, since it is larger than the sum of its proper divisors (157065).

1099399 is an equidigital number, since it uses as much as digits as its factorization.

1099399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157064.

The product of its (nonzero) digits is 19683, while the sum is 40.

The square root of 1099399 is about 1048.5222935160. The cubic root of 1099399 is about 103.2092081101.

The spelling of 1099399 in words is "one million, ninety-nine thousand, three hundred ninety-nine".