1535140240 has 20 divisors (see below), whose sum is σ = 3569201244. Its totient is φ = 614056064.

The previous prime is 1535140237. The next prime is 1535140241. The reversal of 1535140240 is 420415351.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 590684416 + 944455824 = 24304^2 + 30732^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (1535140241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9594547 + ... + 9594706.

Almost surely, 2^1535140240 is an apocalyptic number.

1535140240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1535140240 is an abundant number, since it is smaller than the sum of its proper divisors (2034061004).

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

1535140240 is a wasteful number, since it uses less digits than its factorization.

1535140240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19189266 (or 19189260 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1535140240 is about 39180.8657382657. The cubic root of 1535140240 is about 1153.5843402877.

Adding to 1535140240 its reverse (420415351), we get a palindrome (1955555591).

The spelling of 1535140240 in words is "one billion, five hundred thirty-five million, one hundred forty thousand, two hundred forty".