1244320387 has 2 divisors, whose sum is σ = 1244320388. Its totient is φ = 1244320386.

The previous prime is 1244320373. The next prime is 1244320409. The reversal of 1244320387 is 7830234421.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1244320387 is a prime.

It is not a weakly prime, because it can be changed into another prime (1244320367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622160193 + 622160194.

It is an arithmetic number, because the mean of its divisors is an integer number (622160194).

Almost surely, 2^1244320387 is an apocalyptic number.

1244320387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1244320387 is an equidigital number, since it uses as much as digits as its factorization.

1244320387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 1244320387 is about 35274.9257547057. The cubic root of 1244320387 is about 1075.5833536915.

The spelling of 1244320387 in words is "one billion, two hundred forty-four million, three hundred twenty thousand, three hundred eighty-seven".