1240331887 has 2 divisors, whose sum is σ = 1240331888. Its totient is φ = 1240331886.

The previous prime is 1240331843. The next prime is 1240331891. The reversal of 1240331887 is 7881330421.

It is a strong prime.

It is an emirp because it is prime and its reverse (7881330421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1240331887 - 2⁷ = 1240331759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240331987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620165943 + 620165944.

It is an arithmetic number, because the mean of its divisors is an integer number (620165944).

Almost surely, 2^1240331887 is an apocalyptic number.

1240331887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240331887 is an equidigital number, since it uses as much as digits as its factorization.

1240331887 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 37.

The square root of 1240331887 is about 35218.3458867676. The cubic root of 1240331887 is about 1074.4329115000.

The spelling of 1240331887 in words is "one billion, two hundred forty million, three hundred thirty-one thousand, eight hundred eighty-seven".