1240340531 has 4 divisors (see below), whose sum is σ = 1240411200. Its totient is φ = 1240269864.

The previous prime is 1240340489. The next prime is 1240340557. The reversal of 1240340531 is 1350430421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1240340531 - 2⁶ = 1240340467 is a prime.

It is a super-2 number, since 2×1240340531² = 3076889265682723922, 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 = 1240340497 and 1240340506.

It is not an unprimeable number, because it can be changed into a prime (1240342531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13385 + ... + 51573.

It is an arithmetic number, because the mean of its divisors is an integer number (310102800).

Almost surely, 2^1240340531 is an apocalyptic number.

1240340531 is a deficient number, since it is larger than the sum of its proper divisors (70669).

1240340531 is an equidigital number, since it uses as much as digits as its factorization.

1240340531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70668.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1240340531 is about 35218.4686066842. The cubic root of 1240340531 is about 1074.4354074386.

Adding to 1240340531 its reverse (1350430421), we get a palindrome (2590770952).

The spelling of 1240340531 in words is "one billion, two hundred forty million, three hundred forty thousand, five hundred thirty-one".