1231656 has 64 divisors (see below), whose sum is σ = 3374400. Its totient is φ = 373248.

The previous prime is 1231631. The next prime is 1231663. The reversal of 1231656 is 6561321.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16836 + ... + 16908.

It is an arithmetic number, because the mean of its divisors is an integer number (52725).

2^1231656 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 1231656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1687200).

1231656 is an abundant number, since it is smaller than the sum of its proper divisors (2142744).

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

1231656 is a wasteful number, since it uses less digits than its factorization.

1231656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 134 counting only the distinct ones).

The product of its digits is 1080, while the sum is 24.

The square root of 1231656 is about 1109.7999819787. The cubic root of 1231656 is about 107.1921895995.

Adding to 1231656 its reverse (6561321), we get a palindrome (7792977).

The spelling of 1231656 in words is "one million, two hundred thirty-one thousand, six hundred fifty-six".