51412140 has 144 divisors (see below), whose sum is σ = 170247168. Its totient is φ = 12483072.

The previous prime is 51412117. The next prime is 51412147. The reversal of 51412140 is 4121415.

51412140 is a `hidden beast` number, since 514 + 12 + 140 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (51412147) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 297094 + ... + 297266.

It is an arithmetic number, because the mean of its divisors is an integer number (1182272).

Almost surely, 2^51412140 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 51412140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85123584).

51412140 is an abundant number, since it is smaller than the sum of its proper divisors (118835028).

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

51412140 is a wasteful number, since it uses less digits than its factorization.

51412140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 51412140 is about 7170.2259378628. The cubic root of 51412140 is about 371.8392472277.

Adding to 51412140 its reverse (4121415), we get a palindrome (55533555).

The spelling of 51412140 in words is "fifty-one million, four hundred twelve thousand, one hundred forty".