51954840 has 192 divisors, whose sum is σ = 197121600. Its totient is φ = 11621376.

The previous prime is 51954829. The next prime is 51954857. The reversal of 51954840 is 4845915.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 51954795 and 51954804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 133366 + ... + 133754.

It is an arithmetic number, because the mean of its divisors is an integer number (1026675).

Almost surely, 2^51954840 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 51954840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98560800).

51954840 is an abundant number, since it is smaller than the sum of its proper divisors (145166760).

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

51954840 is a wasteful number, since it uses less digits than its factorization.

51954840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466 (or 459 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 51954840 is about 7207.9705881753. The cubic root of 51954840 is about 373.1430329744.

The spelling of 51954840 in words is "fifty-one million, nine hundred fifty-four thousand, eight hundred forty".