1200123043 has 20 divisors (see below), whose sum is σ = 1426627728. Its totient is φ = 1009160880.

The previous prime is 1200123017. The next prime is 1200123047. The reversal of 1200123043 is 3403210021.

It is a happy number.

It is not a de Polignac number, because 1200123043 - 2²¹ = 1198025891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1200123047) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 122538 + ... + 131968.

Almost surely, 2^1200123043 is an apocalyptic number.

1200123043 is a deficient number, since it is larger than the sum of its proper divisors (226504685).

1200123043 is an frugal number, since it uses more digits than its factorization.

1200123043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9512 (or 9491 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1200123043 is about 34642.7920785840. The cubic root of 1200123043 is about 1062.6948881353.

Adding to 1200123043 its reverse (3403210021), we get a palindrome (4603333064).

The spelling of 1200123043 in words is "one billion, two hundred million, one hundred twenty-three thousand, forty-three".