1540000447 has 2 divisors, whose sum is σ = 1540000448. Its totient is φ = 1540000446.

The previous prime is 1540000411. The next prime is 1540000493. The reversal of 1540000447 is 7440000451.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1540000447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1540000247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770000223 + 770000224.

It is an arithmetic number, because the mean of its divisors is an integer number (770000224).

Almost surely, 2^1540000447 is an apocalyptic number.

1540000447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540000447 is an equidigital number, since it uses as much as digits as its factorization.

1540000447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 1540000447 is about 39242.8394360041. The cubic root of 1540000447 is about 1154.8004620222.

Adding to 1540000447 its reverse (7440000451), we get a palindrome (8980000898).

The spelling of 1540000447 in words is "one billion, five hundred forty million, four hundred forty-seven", and thus it is an aban number.