1240443131 has 8 divisors (see below), whose sum is σ = 1314874800. Its totient is φ = 1166174208.

The previous prime is 1240443121. The next prime is 1240443143. The reversal of 1240443131 is 1313440421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1240443131 - 2⁶ = 1240443067 is a prime.

It is a super-2 number, since 2×1240443131² = 3077398322490166322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1240443097 and 1240443106.

It is not an unprimeable number, because it can be changed into a prime (1240443121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24806 + ... + 55643.

It is an arithmetic number, because the mean of its divisors is an integer number (164359350).

Almost surely, 2^1240443131 is an apocalyptic number.

1240443131 is a deficient number, since it is larger than the sum of its proper divisors (74431669).

1240443131 is an equidigital number, since it uses as much as digits as its factorization.

1240443131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81373.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 1240443131 is about 35219.9251986713. The cubic root of 1240443131 is about 1074.4650321077.

Adding to 1240443131 its reverse (1313440421), we get a palindrome (2553883552).

The spelling of 1240443131 in words is "one billion, two hundred forty million, four hundred forty-three thousand, one hundred thirty-one".