1240543231 has 8 divisors (see below), whose sum is σ = 1306206720. Its totient is φ = 1174916952.

The previous prime is 1240543229. The next prime is 1240543243. The reversal of 1240543231 is 1323450421.

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 1240543231 - 2¹ = 1240543229 is a prime.

It is a super-2 number, since 2×1240543231² = 3077895015959838722, 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 = 1240543196 and 1240543205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240546231) 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, 82416 + ... + 96298.

It is an arithmetic number, because the mean of its divisors is an integer number (163275840).

Almost surely, 2^1240543231 is an apocalyptic number.

1240543231 is a deficient number, since it is larger than the sum of its proper divisors (65663489).

1240543231 is a wasteful number, since it uses less digits than its factorization.

1240543231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18605.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 1240543231 is about 35221.3462405968. The cubic root of 1240543231 is about 1074.4939333538.

Adding to 1240543231 its reverse (1323450421), we get a palindrome (2563993652).

The spelling of 1240543231 in words is "one billion, two hundred forty million, five hundred forty-three thousand, two hundred thirty-one".