1540115140 has 12 divisors (see below), whose sum is σ = 3234241836. Its totient is φ = 616046048.

The previous prime is 1540115111. The next prime is 1540115147. The reversal of 1540115140 is 415110451.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 464143936 + 1075971204 = 21544^2 + 32802^2 .

It is not an unprimeable number, because it can be changed into a prime (1540115147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38502859 + ... + 38502898.

It is an arithmetic number, because the mean of its divisors is an integer number (269520153).

Almost surely, 2^1540115140 is an apocalyptic number.

1540115140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1540115140 is an abundant number, since it is smaller than the sum of its proper divisors (1694126696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1540115140 is a wasteful number, since it uses less digits than its factorization.

1540115140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77005766 (or 77005764 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 1540115140 is about 39244.3007327179. The cubic root of 1540115140 is about 1154.8291295986.

Adding to 1540115140 its reverse (415110451), we get a palindrome (1955225591).

The spelling of 1540115140 in words is "one billion, five hundred forty million, one hundred fifteen thousand, one hundred forty".