51395920 has 40 divisors (see below), whose sum is σ = 120242304. Its totient is φ = 20429952.

The previous prime is 51395891. The next prime is 51395933. The reversal of 51395920 is 2959315.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

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, 11437 + ... + 15283.

Almost surely, 2^51395920 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 51395920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60121152).

51395920 is an abundant number, since it is smaller than the sum of its proper divisors (68846384).

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

51395920 is a wasteful number, since it uses less digits than its factorization.

51395920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4027 (or 4021 counting only the distinct ones).

The product of its (nonzero) digits is 12150, while the sum is 34.

The square root of 51395920 is about 7169.0947824673. The cubic root of 51395920 is about 371.8001392987.

The spelling of 51395920 in words is "fifty-one million, three hundred ninety-five thousand, nine hundred twenty".