1257960787 has 2 divisors, whose sum is σ = 1257960788. Its totient is φ = 1257960786.

The previous prime is 1257960779. The next prime is 1257960793. The reversal of 1257960787 is 7870697521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1257960787 - 2³ = 1257960779 is a prime.

It is not a weakly prime, because it can be changed into another prime (1257960707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628980393 + 628980394.

It is an arithmetic number, because the mean of its divisors is an integer number (628980394).

Almost surely, 2^1257960787 is an apocalyptic number.

1257960787 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257960787 is an equidigital number, since it uses as much as digits as its factorization.

1257960787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1481760, while the sum is 52.

The square root of 1257960787 is about 35467.7429081694. The cubic root of 1257960787 is about 1079.4993069497.

The spelling of 1257960787 in words is "one billion, two hundred fifty-seven million, nine hundred sixty thousand, seven hundred eighty-seven".