256140 has 36 divisors (see below), whose sum is σ = 777504. Its totient is φ = 68256.

The previous prime is 256133. The next prime is 256147. The reversal of 256140 is 41652.

It is a happy number.

256140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (256133) and next prime (256147).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (256147) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 532 + ... + 891.

2²⁵⁶¹⁴⁰ is an apocalyptic number.

256140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256140 is an abundant number, since it is smaller than the sum of its proper divisors (521364).

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

256140 is a wasteful number, since it uses less digits than its factorization.

256140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438 (or 1433 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 256140 is about 506.1027563648. The cubic root of 256140 is about 63.5076147687.

Adding to 256140 its reverse (41652), we get a palindrome (297792).

It can be divided in two parts, 2561 and 40, that added together give a square (2601 = 51²).

The spelling of 256140 in words is "two hundred fifty-six thousand, one hundred forty".