1099143 has 8 divisors (see below), whose sum is σ = 1628400. Its totient is φ = 732744.

The previous prime is 1099139. The next prime is 1099171. The reversal of 1099143 is 3419901.

It is not a de Polignac number, because 1099143 - 2² = 1099139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 40709 = 1099143 / (1 + 0 + 9 + 9 + 1 + 4 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1099103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20328 + ... + 20381.

It is an arithmetic number, because the mean of its divisors is an integer number (203550).

2^1099143 is an apocalyptic number.

1099143 is a deficient number, since it is larger than the sum of its proper divisors (529257).

1099143 is an equidigital number, since it uses as much as digits as its factorization.

1099143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40718 (or 40712 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 1099143 is about 1048.4002098436. The cubic root of 1099143 is about 103.2011965789.

The spelling of 1099143 in words is "one million, ninety-nine thousand, one hundred forty-three".