1284743987 has 2 divisors, whose sum is σ = 1284743988. Its totient is φ = 1284743986.

The previous prime is 1284743983. The next prime is 1284744011. The reversal of 1284743987 is 7893474821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1284743987 - 2² = 1284743983 is a prime.

It is a super-2 number, since 2×1284743987² = 3301134224265312338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1284743983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642371993 + 642371994.

It is an arithmetic number, because the mean of its divisors is an integer number (642371994).

Almost surely, 2^1284743987 is an apocalyptic number.

1284743987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1284743987 is an equidigital number, since it uses as much as digits as its factorization.

1284743987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2709504, while the sum is 53.

The square root of 1284743987 is about 35843.3255572080. The cubic root of 1284743987 is about 1087.1067639238.

The spelling of 1284743987 in words is "one billion, two hundred eighty-four million, seven hundred forty-three thousand, nine hundred eighty-seven".