1237996987 has 2 divisors, whose sum is σ = 1237996988. Its totient is φ = 1237996986.

The previous prime is 1237996973. The next prime is 1237996993. The reversal of 1237996987 is 7896997321.

It is a strong prime.

It is an emirp because it is prime and its reverse (7896997321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1237996987 - 2¹⁹ = 1237472699 is a prime.

It is not a weakly prime, because it can be changed into another prime (1237996387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 618998493 + 618998494.

It is an arithmetic number, because the mean of its divisors is an integer number (618998494).

Almost surely, 2^1237996987 is an apocalyptic number.

1237996987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1237996987 is an equidigital number, since it uses as much as digits as its factorization.

1237996987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10287648, while the sum is 61.

The square root of 1237996987 is about 35185.1813552240. The cubic root of 1237996987 is about 1073.7582885038.

The spelling of 1237996987 in words is "one billion, two hundred thirty-seven million, nine hundred ninety-six thousand, nine hundred eighty-seven".