51403212 has 108 divisors (see below), whose sum is σ = 153644400. Its totient is φ = 14193792.

The previous prime is 51403207. The next prime is 51403273. The reversal of 51403212 is 21230415.

51403212 is a `hidden beast` number, since 51 + 403 + 212 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 344914 + ... + 345062.

Almost surely, 2^51403212 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 51403212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76822200).

51403212 is an abundant number, since it is smaller than the sum of its proper divisors (102241188).

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

51403212 is a wasteful number, since it uses less digits than its factorization.

51403212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 51403212 is about 7169.6033363081. The cubic root of 51403212 is about 371.8177220070.

Adding to 51403212 its reverse (21230415), we get a palindrome (72633627).

It can be divided in two parts, 51403 and 212, that added together give a palindrome (51615).

The spelling of 51403212 in words is "fifty-one million, four hundred three thousand, two hundred twelve".