51989844 has 24 divisors (see below), whose sum is σ = 126584640. Its totient is φ = 16576384.

The previous prime is 51989843. The next prime is 51989869. The reversal of 51989844 is 44898915.

It is a junction number, because it is equal to n+sod(n) for n = 51989793 and 51989802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51989843) 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, 93909 + ... + 94460.

It is an arithmetic number, because the mean of its divisors is an integer number (5274360).

Almost surely, 2^51989844 is an apocalyptic number.

It is an amenable number.

51989844 is an abundant number, since it is smaller than the sum of its proper divisors (74594796).

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

51989844 is a wasteful number, since it uses less digits than its factorization.

51989844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188399 (or 188397 counting only the distinct ones).

The product of its digits is 414720, while the sum is 48.

The square root of 51989844 is about 7210.3983246420. The cubic root of 51989844 is about 373.2268144949.

The spelling of 51989844 in words is "fifty-one million, nine hundred eighty-nine thousand, eight hundred forty-four".