1340123243 has 8 divisors (see below), whose sum is σ = 1419278112. Its totient is φ = 1261004416.

The previous prime is 1340123237. The next prime is 1340123261. The reversal of 1340123243 is 3423210431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1340123243 - 2¹² = 1340119147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1340123203) 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, 122546 + ... + 133032.

It is an arithmetic number, because the mean of its divisors is an integer number (177409764).

Almost surely, 2^1340123243 is an apocalyptic number.

1340123243 is a deficient number, since it is larger than the sum of its proper divisors (79154869).

1340123243 is a wasteful number, since it uses less digits than its factorization.

1340123243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18021.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 1340123243 is about 36607.6937678407. The cubic root of 1340123243 is about 1102.5075694621.

Adding to 1340123243 its reverse (3423210431), we get a palindrome (4763333674).

The spelling of 1340123243 in words is "one billion, three hundred forty million, one hundred twenty-three thousand, two hundred forty-three".