1257871007 has 4 divisors (see below), whose sum is σ = 1259992800. Its totient is φ = 1255749216.

The previous prime is 1257870997. The next prime is 1257871019. The reversal of 1257871007 is 7001787521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7001787521 = 29 ⋅241440949.

It is a cyclic number.

It is not a de Polignac number, because 1257871007 - 2⁸ = 1257870751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257871037) 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 in 3 ways as a sum of consecutive naturals, for example, 1060007 + ... + 1061192.

It is an arithmetic number, because the mean of its divisors is an integer number (314998200).

Almost surely, 2^1257871007 is an apocalyptic number.

1257871007 is a deficient number, since it is larger than the sum of its proper divisors (2121793).

1257871007 is an equidigital number, since it uses as much as digits as its factorization.

1257871007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121792.

The product of its (nonzero) digits is 27440, while the sum is 38.

The square root of 1257871007 is about 35466.4772285041. The cubic root of 1257871007 is about 1079.4736252394.

The spelling of 1257871007 in words is "one billion, two hundred fifty-seven million, eight hundred seventy-one thousand, seven".