255140240 has 20 divisors (see below), whose sum is σ = 593201244. Its totient is φ = 102056064.

The previous prime is 255140239. The next prime is 255140269. The reversal of 255140240 is 42041552.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 98089216 + 157051024 = 9904^2 + 12532^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1594547 + ... + 1594706.

Almost surely, 2^255140240 is an apocalyptic number.

255140240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255140240 is an abundant number, since it is smaller than the sum of its proper divisors (338061004).

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

255140240 is a wasteful number, since it uses less digits than its factorization.

255140240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3189266 (or 3189260 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 255140240 is about 15973.1099038353. The cubic root of 255140240 is about 634.2487985828.

Adding to 255140240 its reverse (42041552), we get a palindrome (297181792).

The spelling of 255140240 in words is "two hundred fifty-five million, one hundred forty thousand, two hundred forty".