1099979 has 4 divisors (see below), whose sum is σ = 1102176. Its totient is φ = 1097784.

The previous prime is 1099961. The next prime is 1099997. The reversal of 1099979 is 9799901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9799901 = 487 ⋅20123.

It is an interprime number because it is at equal distance from previous prime (1099961) and next prime (1099997).

It is a cyclic number.

It is not a de Polignac number, because 1099979 - 2⁸ = 1099723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1099079) 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, 62 + ... + 1484.

It is an arithmetic number, because the mean of its divisors is an integer number (275544).

2^1099979 is an apocalyptic number.

1099979 is a deficient number, since it is larger than the sum of its proper divisors (2197).

1099979 is an equidigital number, since it uses as much as digits as its factorization.

1099979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2196.

The product of its (nonzero) digits is 45927, while the sum is 44.

The square root of 1099979 is about 1048.7988367652. The cubic root of 1099979 is about 103.2273546359.

The spelling of 1099979 in words is "one million, ninety-nine thousand, nine hundred seventy-nine".