1257967 has 4 divisors (see below), whose sum is σ = 1263600. Its totient is φ = 1252336.

The previous prime is 1257961. The next prime is 1257973. The reversal of 1257967 is 7697521.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1257961) and next prime (1257973).

It is a cyclic number.

It is not a de Polignac number, because 1257967 - 2³ = 1257959 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 (1257961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2467 + ... + 2932.

It is an arithmetic number, because the mean of its divisors is an integer number (315900).

2^1257967 is an apocalyptic number.

1257967 is a deficient number, since it is larger than the sum of its proper divisors (5633).

1257967 is an equidigital number, since it uses as much as digits as its factorization.

1257967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5632.

The product of its digits is 26460, while the sum is 37.

The square root of 1257967 is about 1121.5912802799. The cubic root of 1257967 is about 107.9501084143.

The spelling of 1257967 in words is "one million, two hundred fifty-seven thousand, nine hundred sixty-seven".