1340143243 has 8 divisors (see below), whose sum is σ = 1353166848. Its totient is φ = 1327158504.

The previous prime is 1340143241. The next prime is 1340143249. The reversal of 1340143243 is 3423410431.

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 1340143243 - 2¹ = 1340143241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1340143241) 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, 62130 + ... + 80872.

It is an arithmetic number, because the mean of its divisors is an integer number (169145856).

Almost surely, 2^1340143243 is an apocalyptic number.

1340143243 is a deficient number, since it is larger than the sum of its proper divisors (13023605).

1340143243 is a wasteful number, since it uses less digits than its factorization.

1340143243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19433.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 1340143243 is about 36607.9669334422. The cubic root of 1340143243 is about 1102.5130540427.

Adding to 1340143243 its reverse (3423410431), we get a palindrome (4763553674).

It can be divided in two parts, 13401 and 43243, that added together give a square (56644 = 238²).

The spelling of 1340143243 in words is "one billion, three hundred forty million, one hundred forty-three thousand, two hundred forty-three".