1540009 has 2 divisors, whose sum is σ = 1540010. Its totient is φ = 1540008.

The previous prime is 1540003. The next prime is 1540027. The reversal of 1540009 is 9000451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1010025 + 529984 = 1005^2 + 728^2 .

It is an emirp because it is prime and its reverse (9000451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1540009 - 2¹¹ = 1537961 is a prime.

It is not a weakly prime, because it can be changed into another prime (1540003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770004 + 770005.

It is an arithmetic number, because the mean of its divisors is an integer number (770005).

2^1540009 is an apocalyptic number.

It is an amenable number.

1540009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540009 is an equidigital number, since it uses as much as digits as its factorization.

1540009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 1540009 is about 1240.9709907971. The cubic root of 1540009 is about 115.4802599898.

The spelling of 1540009 in words is "one million, five hundred forty thousand, nine".