1287421307 has 2 divisors, whose sum is σ = 1287421308. Its totient is φ = 1287421306.

The previous prime is 1287421301. The next prime is 1287421363. The reversal of 1287421307 is 7031247821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1287421307 - 2⁶ = 1287421243 is a prime.

It is not a weakly prime, because it can be changed into another prime (1287421301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643710653 + 643710654.

It is an arithmetic number, because the mean of its divisors is an integer number (643710654).

Almost surely, 2^1287421307 is an apocalyptic number.

1287421307 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287421307 is an equidigital number, since it uses as much as digits as its factorization.

1287421307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 1287421307 is about 35880.6536590403. The cubic root of 1287421307 is about 1087.8613924110.

The spelling of 1287421307 in words is "one billion, two hundred eighty-seven million, four hundred twenty-one thousand, three hundred seven".