1240543 has 2 divisors, whose sum is σ = 1240544. Its totient is φ = 1240542.

The previous prime is 1240523. The next prime is 1240553. The reversal of 1240543 is 3450421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1240543 - 2⁵ = 1240511 is a prime.

1240543 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1240543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620271 + 620272.

It is an arithmetic number, because the mean of its divisors is an integer number (620272).

2^1240543 is an apocalyptic number.

1240543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240543 is an equidigital number, since it uses as much as digits as its factorization.

1240543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 1240543 is about 1113.7966600776. The cubic root of 1240543 is about 107.4493866660.

Adding to 1240543 its reverse (3450421), we get a palindrome (4690964).

The spelling of 1240543 in words is "one million, two hundred forty thousand, five hundred forty-three".