1240387 has 2 divisors, whose sum is σ = 1240388. Its totient is φ = 1240386.

The previous prime is 1240363. The next prime is 1240391. The reversal of 1240387 is 7830421.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240387 is a prime.

1240387 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1240307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620193 + 620194.

It is an arithmetic number, because the mean of its divisors is an integer number (620194).

2^1240387 is an apocalyptic number.

1240387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240387 is an equidigital number, since it uses as much as digits as its factorization.

1240387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 1240387 is about 1113.7266271397. The cubic root of 1240387 is about 107.4448825075. Note that the first 3 decimals are identical.

The spelling of 1240387 in words is "one million, two hundred forty thousand, three hundred eighty-seven".