1540249 has 2 divisors, whose sum is σ = 1540250. Its totient is φ = 1540248.

The previous prime is 1540243. The next prime is 1540289. The reversal of 1540249 is 9420451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1040400 + 499849 = 1020^2 + 707^2 .

It is an emirp because it is prime and its reverse (9420451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1540249 - 2⁹ = 1539737 is a prime.

It is not a weakly prime, because it can be changed into another prime (1540243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770124 + 770125.

It is an arithmetic number, because the mean of its divisors is an integer number (770125).

2^1540249 is an apocalyptic number.

It is an amenable number.

1540249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540249 is an equidigital number, since it uses as much as digits as its factorization.

1540249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1540249 is about 1241.0676855031. The cubic root of 1540249 is about 115.4862586177.

It can be divided in two parts, 15402 and 49, that added together give a palindrome (15451).

The spelling of 1540249 in words is "one million, five hundred forty thousand, two hundred forty-nine".