51859420 has 24 divisors (see below), whose sum is σ = 109147248. Its totient is φ = 20697600.

The previous prime is 51859403. The next prime is 51859421. The reversal of 51859420 is 2495815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51859421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7180 + ... + 12460.

It is an arithmetic number, because the mean of its divisors is an integer number (4547802).

Almost surely, 2^51859420 is an apocalyptic number.

It is an amenable number.

51859420 is an abundant number, since it is smaller than the sum of its proper divisors (57287828).

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

51859420 is a wasteful number, since it uses less digits than its factorization.

51859420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5781 (or 5779 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 51859420 is about 7201.3484848325. The cubic root of 51859420 is about 372.9144554381.

The spelling of 51859420 in words is "fifty-one million, eight hundred fifty-nine thousand, four hundred twenty".