1257156 has 36 divisors (see below), whose sum is σ = 3249792. Its totient is φ = 409584.

The previous prime is 1257131. The next prime is 1257163. The reversal of 1257156 is 6517521.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1321 + ... + 2063.

It is an arithmetic number, because the mean of its divisors is an integer number (90272).

2^1257156 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 1257156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1624896).

1257156 is an abundant number, since it is smaller than the sum of its proper divisors (1992636).

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

1257156 is a wasteful number, since it uses less digits than its factorization.

1257156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800 (or 795 counting only the distinct ones).

The product of its digits is 2100, while the sum is 27.

The square root of 1257156 is about 1121.2296820902. The cubic root of 1257156 is about 107.9269052729.

The spelling of 1257156 in words is "one million, two hundred fifty-seven thousand, one hundred fifty-six".