255915940 has 192 divisors, whose sum is σ = 696729600. Its totient is φ = 76944384.

The previous prime is 255915937. The next prime is 255915949. The reversal of 255915940 is 49519552.

It is a junction number, because it is equal to n+sod(n) for n = 255915893 and 255915902.

It is not an unprimeable number, because it can be changed into a prime (255915949) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2875416 + ... + 2875504.

It is an arithmetic number, because the mean of its divisors is an integer number (3628800).

Almost surely, 2^255915940 is an apocalyptic number.

255915940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 255915940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (348364800).

255915940 is an abundant number, since it is smaller than the sum of its proper divisors (440813660).

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

255915940 is a wasteful number, since it uses less digits than its factorization.

255915940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 40.

The square root of 255915940 is about 15997.3729093248. The cubic root of 255915940 is about 634.8909147768.

It can be divided in two parts, 255915 and 940, that multiplied together give a square (240560100 = 15510²).

The spelling of 255915940 in words is "two hundred fifty-five million, nine hundred fifteen thousand, nine hundred forty".