253240 has 32 divisors (see below), whose sum is σ = 614880. Its totient is φ = 93312.

The previous prime is 253229. The next prime is 253243. The reversal of 253240 is 42352.

253240 = T₁₁ + T₁₂ + ... + T₁₁₄.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253243) 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 7 ways as a sum of consecutive naturals, for example, 277 + ... + 763.

It is an arithmetic number, because the mean of its divisors is an integer number (19215).

2²⁵³²⁴⁰ is an apocalyptic number.

253240 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 253240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (307440).

253240 is an abundant number, since it is smaller than the sum of its proper divisors (361640).

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

253240 is a wasteful number, since it uses less digits than its factorization.

253240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511 (or 507 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 253240 is about 503.2295698784. The cubic root of 253240 is about 63.2670281763.

Adding to 253240 its reverse (42352), we get a palindrome (295592).

The spelling of 253240 in words is "two hundred fifty-three thousand, two hundred forty".