1540093538 has 4 divisors (see below), whose sum is σ = 2310140310. Its totient is φ = 770046768.

The previous prime is 1540093519. The next prime is 1540093543. The reversal of 1540093538 is 8353900451.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 816644929 + 723448609 = 28577^2 + 26897^2 .

It is an unprimeable number.

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, 385023383 + ... + 385023386.

Almost surely, 2^1540093538 is an apocalyptic number.

1540093538 is a deficient number, since it is larger than the sum of its proper divisors (770046772).

1540093538 is an equidigital number, since it uses as much as digits as its factorization.

1540093538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770046771.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 1540093538 is about 39244.0255070756. The cubic root of 1540093538 is about 1154.8237302760.

Adding to 1540093538 its reverse (8353900451), we get a palindrome (9893993989).

The spelling of 1540093538 in words is "one billion, five hundred forty million, ninety-three thousand, five hundred thirty-eight".