1157987 has 2 divisors, whose sum is σ = 1157988. Its totient is φ = 1157986.

The previous prime is 1157977. The next prime is 1158007. The reversal of 1157987 is 7897511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1157987 - 2¹⁰ = 1156963 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1157987.

It is not a weakly prime, because it can be changed into another prime (1157977) 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, 578993 + 578994.

It is an arithmetic number, because the mean of its divisors is an integer number (578994).

2^1157987 is an apocalyptic number.

1157987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1157987 is an equidigital number, since it uses as much as digits as its factorization.

1157987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17640, while the sum is 38.

The square root of 1157987 is about 1076.0980438603. The cubic root of 1157987 is about 105.0109436817.

The spelling of 1157987 in words is "one million, one hundred fifty-seven thousand, nine hundred eighty-seven".