1391256 has 80 divisors (see below), whose sum is σ = 4138200. Its totient is φ = 435456.

The previous prime is 1391239. The next prime is 1391261. The reversal of 1391256 is 6521931.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12256 + ... + 12368.

2^1391256 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 1391256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2069100).

1391256 is an abundant number, since it is smaller than the sum of its proper divisors (2746944).

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

1391256 is a wasteful number, since it uses less digits than its factorization.

1391256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150 (or 137 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 1391256 is about 1179.5151546292. The cubic root of 1391256 is about 111.6355072587.

The spelling of 1391256 in words is "one million, three hundred ninety-one thousand, two hundred fifty-six".