251240 has 32 divisors (see below), whose sum is σ = 617760. Its totient is φ = 91200.

The previous prime is 251233. The next prime is 251257. The reversal of 251240 is 42152.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155 + ... + 725.

It is an arithmetic number, because the mean of its divisors is an integer number (19305).

2²⁵¹²⁴⁰ is an apocalyptic number.

251240 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 251240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (308880).

251240 is an abundant number, since it is smaller than the sum of its proper divisors (366520).

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

251240 is a wasteful number, since it uses less digits than its factorization.

251240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593 (or 589 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 251240 is about 501.2384662015. The cubic root of 251240 is about 63.1000342407.

Adding to 251240 its reverse (42152), we get a palindrome (293392).

It can be divided in two parts, 2512 and 40, that added together give a palindrome (2552).

The spelling of 251240 in words is "two hundred fifty-one thousand, two hundred forty".