1240312783 has 2 divisors, whose sum is σ = 1240312784. Its totient is φ = 1240312782.

The previous prime is 1240312757. The next prime is 1240312793. The reversal of 1240312783 is 3872130421.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240312783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240312793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620156391 + 620156392.

It is an arithmetic number, because the mean of its divisors is an integer number (620156392).

Almost surely, 2^1240312783 is an apocalyptic number.

1240312783 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240312783 is an equidigital number, since it uses as much as digits as its factorization.

1240312783 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 1240312783 is about 35218.0746634452. The cubic root of 1240312783 is about 1074.4273952153.

The spelling of 1240312783 in words is "one billion, two hundred forty million, three hundred twelve thousand, seven hundred eighty-three".