51323140 has 48 divisors (see below), whose sum is σ = 119105280. Its totient is φ = 18420480.

The previous prime is 51323137. The next prime is 51323141. The reversal of 51323140 is 4132315.

It is not an unprimeable number, because it can be changed into a prime (51323141) 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, 15904 + ... + 18856.

It is an arithmetic number, because the mean of its divisors is an integer number (2481360).

Almost surely, 2^51323140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51323140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59552640).

51323140 is an abundant number, since it is smaller than the sum of its proper divisors (67782140).

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

51323140 is a wasteful number, since it uses less digits than its factorization.

51323140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3052 (or 3050 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 51323140 is about 7164.0170295722. The cubic root of 51323140 is about 371.6245585851.

Adding to 51323140 its reverse (4132315), we get a palindrome (55455455).

It can be divided in two parts, 513 and 23140, that added together give a triangular number (23653 = T₂₁₇).

The spelling of 51323140 in words is "fifty-one million, three hundred twenty-three thousand, one hundred forty".