251343040 has 112 divisors (see below), whose sum is σ = 665683200. Its totient is φ = 89763840.

The previous prime is 251343023. The next prime is 251343061. The reversal of 251343040 is 40343152.

251343040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127986 + ... + 129934.

It is an arithmetic number, because the mean of its divisors is an integer number (5943600).

Almost surely, 2^251343040 is an apocalyptic number.

251343040 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 251343040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (332841600).

251343040 is an abundant number, since it is smaller than the sum of its proper divisors (414340160).

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

251343040 is a wasteful number, since it uses less digits than its factorization.

251343040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2010 (or 2000 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 251343040 is about 15853.8020676430. The cubic root of 251343040 is about 631.0865937855.

Adding to 251343040 its reverse (40343152), we get a palindrome (291686192).

The spelling of 251343040 in words is "two hundred fifty-one million, three hundred forty-three thousand, forty".