1540243 has 2 divisors, whose sum is σ = 1540244. Its totient is φ = 1540242.

The previous prime is 1540229. The next prime is 1540249. The reversal of 1540243 is 3420451.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1540243 - 2⁵ = 1540211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1540243.

It is not a weakly prime, because it can be changed into another prime (1540249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770121 + 770122.

It is an arithmetic number, because the mean of its divisors is an integer number (770122).

2^1540243 is an apocalyptic number.

1540243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540243 is an equidigital number, since it uses as much as digits as its factorization.

1540243 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 1540243 is about 1241.0652682273. The cubic root of 1540243 is about 115.4861086596.

Adding to 1540243 its reverse (3420451), we get a palindrome (4960694).

The spelling of 1540243 in words is "one million, five hundred forty thousand, two hundred forty-three".