1140123243 has 16 divisors (see below), whose sum is σ = 1739933696. Its totient is φ = 650522880.

The previous prime is 1140123191. The next prime is 1140123247. The reversal of 1140123243 is 3423210411.

It is a de Polignac number, because none of the positive numbers 2^k-1140123243 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1140123247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26203 + ... + 54468.

It is an arithmetic number, because the mean of its divisors is an integer number (108745856).

Almost surely, 2^1140123243 is an apocalyptic number.

1140123243 is a deficient number, since it is larger than the sum of its proper divisors (599810453).

1140123243 is an equidigital number, since it uses as much as digits as its factorization.

1140123243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81354.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1140123243 is about 33765.7110542633. The cubic root of 1140123243 is about 1044.6815702177.

Adding to 1140123243 its reverse (3423210411), we get a palindrome (4563333654).

The spelling of 1140123243 in words is "one billion, one hundred forty million, one hundred twenty-three thousand, two hundred forty-three".