1213987939 has 2 divisors, whose sum is σ = 1213987940. Its totient is φ = 1213987938.

The previous prime is 1213987933. The next prime is 1213987967. The reversal of 1213987939 is 9397893121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1213987939 - 2¹⁷ = 1213856867 is a prime.

It is not a weakly prime, because it can be changed into another prime (1213987933) 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, 606993969 + 606993970.

It is an arithmetic number, because the mean of its divisors is an integer number (606993970).

Almost surely, 2^1213987939 is an apocalyptic number.

1213987939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213987939 is an equidigital number, since it uses as much as digits as its factorization.

1213987939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 52.

The square root of 1213987939 is about 34842.3297010978. The cubic root of 1213987939 is about 1066.7716297860.

The spelling of 1213987939 in words is "one billion, two hundred thirteen million, nine hundred eighty-seven thousand, nine hundred thirty-nine".