1266700387 has 2 divisors, whose sum is σ = 1266700388. Its totient is φ = 1266700386.

The previous prime is 1266700381. The next prime is 1266700397. The reversal of 1266700387 is 7830076621.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1266700387 is a prime.

It is not a weakly prime, because it can be changed into another prime (1266700381) 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, 633350193 + 633350194.

It is an arithmetic number, because the mean of its divisors is an integer number (633350194).

Almost surely, 2^1266700387 is an apocalyptic number.

1266700387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266700387 is an equidigital number, since it uses as much as digits as its factorization.

1266700387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 1266700387 is about 35590.7345667380. The cubic root of 1266700387 is about 1081.9934567160.

The spelling of 1266700387 in words is "one billion, two hundred sixty-six million, seven hundred thousand, three hundred eighty-seven".