1231180440 has 64 divisors (see below), whose sum is σ = 4221192960. Its totient is φ = 281412480.

The previous prime is 1231180427. The next prime is 1231180441. The reversal of 1231180440 is 440811321.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1231180440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231180441) 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, 732006 + ... + 733685.

It is an arithmetic number, because the mean of its divisors is an integer number (65956140).

Almost surely, 2^1231180440 is an apocalyptic number.

1231180440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231180440 is an abundant number, since it is smaller than the sum of its proper divisors (2990012520).

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

1231180440 is a wasteful number, since it uses less digits than its factorization.

1231180440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465712 (or 1465708 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 1231180440 is about 35088.1809160863. The cubic root of 1231180440 is about 1071.7839167759.

Adding to 1231180440 its reverse (440811321), we get a palindrome (1671991761).

The spelling of 1231180440 in words is "one billion, two hundred thirty-one million, one hundred eighty thousand, four hundred forty".