1540719493 has 2 divisors, whose sum is σ = 1540719494. Its totient is φ = 1540719492.

The previous prime is 1540719473. The next prime is 1540719527. The reversal of 1540719493 is 3949170451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1094749569 + 445969924 = 33087^2 + 21118^2 .

It is a cyclic number.

It is not a de Polignac number, because 1540719493 - 2⁹ = 1540718981 is a prime.

It is a super-2 number, since 2×1540719493² = 4747633112220354098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1540719463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770359746 + 770359747.

It is an arithmetic number, because the mean of its divisors is an integer number (770359747).

Almost surely, 2^1540719493 is an apocalyptic number.

It is an amenable number.

1540719493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540719493 is an equidigital number, since it uses as much as digits as its factorization.

1540719493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 1540719493 is about 39251.9998598798. Note that the first 3 decimals coincide. The cubic root of 1540719493 is about 1154.9801644489.

The spelling of 1540719493 in words is "one billion, five hundred forty million, seven hundred nineteen thousand, four hundred ninety-three".