51425140 has 48 divisors (see below), whose sum is σ = 117750528. Its totient is φ = 18751104.

The previous prime is 51425107. The next prime is 51425147. The reversal of 51425140 is 4152415.

51425140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51425147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20389 + ... + 22771.

It is an arithmetic number, because the mean of its divisors is an integer number (2453136).

Almost surely, 2^51425140 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 51425140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58875264).

51425140 is an abundant number, since it is smaller than the sum of its proper divisors (66325388).

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

51425140 is a wasteful number, since it uses less digits than its factorization.

51425140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2488 (or 2486 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 51425140 is about 7171.1324070889. The cubic root of 51425140 is about 371.8705854995.

Adding to 51425140 its reverse (4152415), we get a palindrome (55577555).

The spelling of 51425140 in words is "fifty-one million, four hundred twenty-five thousand, one hundred forty".