1257872 has 40 divisors (see below), whose sum is σ = 3041472. Its totient is φ = 489600.

The previous prime is 1257869. The next prime is 1257877. The reversal of 1257872 is 2787521.

It is not an unprimeable number, because it can be changed into a prime (1257877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 722 + ... + 1742.

2^1257872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1257872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1520736).

1257872 is an abundant number, since it is smaller than the sum of its proper divisors (1783600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1257872 is a wasteful number, since it uses less digits than its factorization.

1257872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047 (or 1041 counting only the distinct ones).

The product of its digits is 7840, while the sum is 32.

The square root of 1257872 is about 1121.5489289371. The cubic root of 1257872 is about 107.9473909295.

It can be divided in two parts, 125 and 7872, that added together give a palindrome (7997).

The spelling of 1257872 in words is "one million, two hundred fifty-seven thousand, eight hundred seventy-two".