251238460 has 48 divisors (see below), whose sum is σ = 580900320. Its totient is φ = 90512640.

The previous prime is 251238457. The next prime is 251238467. The reversal of 251238460 is 64832152.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251238467) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18742 + ... + 29218.

It is an arithmetic number, because the mean of its divisors is an integer number (12102090).

Almost surely, 2^251238460 is an apocalyptic number.

251238460 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 251238460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290450160).

251238460 is an abundant number, since it is smaller than the sum of its proper divisors (329661860).

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

251238460 is a wasteful number, since it uses less digits than its factorization.

251238460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10606 (or 10604 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 251238460 is about 15850.5034620355. The cubic root of 251238460 is about 630.9990531454. Note that the first 3 decimals are identical.

The spelling of 251238460 in words is "two hundred fifty-one million, two hundred thirty-eight thousand, four hundred sixty".