1540223743 has 2 divisors, whose sum is σ = 1540223744. Its totient is φ = 1540223742.

The previous prime is 1540223731. The next prime is 1540223767. The reversal of 1540223743 is 3473220451.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1540223743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1540220743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770111871 + 770111872.

It is an arithmetic number, because the mean of its divisors is an integer number (770111872).

Almost surely, 2^1540223743 is an apocalyptic number.

1540223743 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540223743 is an equidigital number, since it uses as much as digits as its factorization.

1540223743 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 31.

The square root of 1540223743 is about 39245.6843869488. The cubic root of 1540223743 is about 1154.8562736644.

The spelling of 1540223743 in words is "one billion, five hundred forty million, two hundred twenty-three thousand, seven hundred forty-three".