1540440497 has 2 divisors, whose sum is σ = 1540440498. Its totient is φ = 1540440496.

The previous prime is 1540440457. The next prime is 1540440509. The reversal of 1540440497 is 7940440451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1532800801 + 7639696 = 39151^2 + 2764^2 .

It is a cyclic number.

It is not a de Polignac number, because 1540440497 - 2¹⁰ = 1540439473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1540440497.

It is not a weakly prime, because it can be changed into another prime (1540440427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770220248 + 770220249.

It is an arithmetic number, because the mean of its divisors is an integer number (770220249).

Almost surely, 2^1540440497 is an apocalyptic number.

It is an amenable number.

1540440497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540440497 is an equidigital number, since it uses as much as digits as its factorization.

1540440497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 1540440497 is about 39248.4457908845. The cubic root of 1540440497 is about 1154.9104450094.

The spelling of 1540440497 in words is "one billion, five hundred forty million, four hundred forty thousand, four hundred ninety-seven".