1100043 has 24 divisors (see below), whose sum is σ = 1913600. Its totient is φ = 594864.

The previous prime is 1100041. The next prime is 1100051. The reversal of 1100043 is 3400011.

It is not a de Polignac number, because 1100043 - 2¹ = 1100041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1099998 and 1100034.

It is not an unprimeable number, because it can be changed into a prime (1100041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 738 + ... + 1656.

2^1100043 is an apocalyptic number.

1100043 is a deficient number, since it is larger than the sum of its proper divisors (813557).

1100043 is a wasteful number, since it uses less digits than its factorization.

1100043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951 (or 948 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 1100043 is about 1048.8293474155. The cubic root of 1100043 is about 103.2293566204.

Adding to 1100043 its reverse (3400011), we get a palindrome (4500054).

Subtracting 1100043 from its reverse (3400011), we obtain a cube (2299968 = 132³).

The spelling of 1100043 in words is "one million, one hundred thousand, forty-three".