1231140 has 72 divisors (see below), whose sum is σ = 3713472. Its totient is φ = 304640.

The previous prime is 1231129. The next prime is 1231141. The reversal of 1231140 is 411321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1231141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17305 + ... + 17375.

It is an arithmetic number, because the mean of its divisors is an integer number (51576).

2^1231140 is an apocalyptic number.

1231140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1856736).

1231140 is an abundant number, since it is smaller than the sum of its proper divisors (2482332).

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

1231140 is a wasteful number, since it uses less digits than its factorization.

1231140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1231140 is about 1109.5674833015. The cubic root of 1231140 is about 107.1772181855.

Adding to 1231140 its reverse (411321), we get a palindrome (1642461).

It can be divided in two parts, 12 and 31140, that multiplied together give a triangular number (373680 = T₈₆₄).

The spelling of 1231140 in words is "one million, two hundred thirty-one thousand, one hundred forty".