51293940 has 24 divisors (see below), whose sum is σ = 143623200. Its totient is φ = 13678368.

The previous prime is 51293909. The next prime is 51293959. The reversal of 51293940 is 4939215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427390 + ... + 427509.

It is an arithmetic number, because the mean of its divisors is an integer number (5984300).

Almost surely, 2^51293940 is an apocalyptic number.

It is an amenable number.

51293940 is an abundant number, since it is smaller than the sum of its proper divisors (92329260).

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

51293940 is a wasteful number, since it uses less digits than its factorization.

51293940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854911 (or 854909 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 51293940 is about 7161.9787768465. The cubic root of 51293940 is about 371.5540673427.

The spelling of 51293940 in words is "fifty-one million, two hundred ninety-three thousand, nine hundred forty".