51386412 has 96 divisors (see below), whose sum is σ = 157409280. Its totient is φ = 12640320.

The previous prime is 51386389. The next prime is 51386459. The reversal of 51386412 is 21468315.

It is a self number, because there is not a number n which added to its sum of digits gives 51386412.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16093 + ... + 19019.

It is an arithmetic number, because the mean of its divisors is an integer number (1639680).

Almost surely, 2^51386412 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 51386412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78704640).

51386412 is an abundant number, since it is smaller than the sum of its proper divisors (106022868).

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

51386412 is a wasteful number, since it uses less digits than its factorization.

51386412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2971 (or 2969 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 51386412 is about 7168.4316276296. The cubic root of 51386412 is about 371.7772108008. Note that the first 3 decimals are identical.

The spelling of 51386412 in words is "fifty-one million, three hundred eighty-six thousand, four hundred twelve".