1540040525 has 6 divisors (see below), whose sum is σ = 1909650282. Its totient is φ = 1232032400.

The previous prime is 1540040519. The next prime is 1540040527. The reversal of 1540040525 is 5250400451.

It can be written as a sum of positive squares in 3 ways, for example, as 23639044 + 1516401481 = 4862^2 + 38941^2 .

It is not a de Polignac number, because 1540040525 - 2¹² = 1540036429 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1540040494 and 1540040503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540040527) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30800786 + ... + 30800835.

It is an arithmetic number, because the mean of its divisors is an integer number (318275047).

Almost surely, 2^1540040525 is an apocalyptic number.

It is an amenable number.

1540040525 is a deficient number, since it is larger than the sum of its proper divisors (369609757).

1540040525 is an equidigital number, since it uses as much as digits as its factorization.

1540040525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61601631 (or 61601626 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 1540040525 is about 39243.3500736112. The cubic root of 1540040525 is about 1154.8104797014.

Adding to 1540040525 its reverse (5250400451), we get a palindrome (6790440976).

The spelling of 1540040525 in words is "one billion, five hundred forty million, forty thousand, five hundred twenty-five".