1240310343 has 4 divisors (see below), whose sum is σ = 1653747128. Its totient is φ = 826873560.

The previous prime is 1240310303. The next prime is 1240310347. The reversal of 1240310343 is 3430130421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3430130421 = 3 ⋅1143376807.

It is a de Polignac number, because none of the positive numbers 2^k-1240310343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240310347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206718388 + ... + 206718393.

It is an arithmetic number, because the mean of its divisors is an integer number (413436782).

Almost surely, 2^1240310343 is an apocalyptic number.

1240310343 is a deficient number, since it is larger than the sum of its proper divisors (413436785).

1240310343 is an equidigital number, since it uses as much as digits as its factorization.

1240310343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413436784.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 1240310343 is about 35218.0400221250. The cubic root of 1240310343 is about 1074.4266906606.

Adding to 1240310343 its reverse (3430130421), we get a palindrome (4670440764).

The spelling of 1240310343 in words is "one billion, two hundred forty million, three hundred ten thousand, three hundred forty-three".