1231356 has 48 divisors (see below), whose sum is σ = 3338496. Its totient is φ = 345984.

The previous prime is 1231339. The next prime is 1231357. The reversal of 1231356 is 6531321.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a zygodrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231357) 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, 8920 + ... + 9056.

It is an arithmetic number, because the mean of its divisors is an integer number (69552).

2^1231356 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 1231356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1669248).

1231356 is an abundant number, since it is smaller than the sum of its proper divisors (2107140).

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

1231356 is a wasteful number, since it uses less digits than its factorization.

1231356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258 (or 256 counting only the distinct ones).

The product of its digits is 540, while the sum is 21.

The square root of 1231356 is about 1109.6648142570. The cubic root of 1231356 is about 107.1834857980.

Adding to 1231356 its reverse (6531321), we get a palindrome (7762677).

The spelling of 1231356 in words is "one million, two hundred thirty-one thousand, three hundred fifty-six".