251032340 has 48 divisors (see below), whose sum is σ = 581590800. Its totient is φ = 90424320.

The previous prime is 251032337. The next prime is 251032343. The reversal of 251032340 is 43230152.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (251032337) and next prime (251032343).

It can be written as a sum of positive squares in 8 ways, for example, as 160630276 + 90402064 = 12674^2 + 9508^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251032343) 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, 1115 + ... + 22434.

It is an arithmetic number, because the mean of its divisors is an integer number (12116475).

Almost surely, 2^251032340 is an apocalyptic number.

251032340 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 251032340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290795400).

251032340 is an abundant number, since it is smaller than the sum of its proper divisors (330558460).

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

251032340 is a wasteful number, since it uses less digits than its factorization.

251032340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23612 (or 23610 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 251032340 is about 15844.0001262307. Note that the first 3 decimals coincide. The cubic root of 251032340 is about 630.8264454042.

Adding to 251032340 its reverse (43230152), we get a palindrome (294262492).

The spelling of 251032340 in words is "two hundred fifty-one million, thirty-two thousand, three hundred forty".