1257861 has 16 divisors (see below), whose sum is σ = 1870848. Its totient is φ = 745200.

The previous prime is 1257859. The next prime is 1257869. The reversal of 1257861 is 1687521.

It is not a de Polignac number, because 1257861 - 2¹ = 1257859 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1146 + ... + 1956.

It is an arithmetic number, because the mean of its divisors is an integer number (116928).

2^1257861 is an apocalyptic number.

1257861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1257861 is a deficient number, since it is larger than the sum of its proper divisors (612987).

1257861 is a wasteful number, since it uses less digits than its factorization.

1257861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872.

The product of its digits is 3360, while the sum is 30.

The square root of 1257861 is about 1121.5440249941. The cubic root of 1257861 is about 107.9470762646.

The spelling of 1257861 in words is "one million, two hundred fifty-seven thousand, eight hundred sixty-one".