1231040440 has 32 divisors (see below), whose sum is σ = 3165533280. Its totient is φ = 422070912.

The previous prime is 1231040429. The next prime is 1231040453. The reversal of 1231040440 is 440401321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2198007 + ... + 2198566.

It is an arithmetic number, because the mean of its divisors is an integer number (98922915).

Almost surely, 2^1231040440 is an apocalyptic number.

1231040440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231040440 is an abundant number, since it is smaller than the sum of its proper divisors (1934492840).

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

1231040440 is a wasteful number, since it uses less digits than its factorization.

1231040440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4396591 (or 4396587 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1231040440 is about 35086.1858856160. The cubic root of 1231040440 is about 1071.7432903356.

Adding to 1231040440 its reverse (440401321), we get a palindrome (1671441761).

The spelling of 1231040440 in words is "one billion, two hundred thirty-one million, forty thousand, four hundred forty".