51384420 has 36 divisors (see below), whose sum is σ = 155866620. Its totient is φ = 13702464.

The previous prime is 51384413. The next prime is 51384427. The reversal of 51384420 is 2448315.

It is an interprime number because it is at equal distance from previous prime (51384413) and next prime (51384427).

It can be written as a sum of positive squares in 2 ways, for example, as 21178404 + 30206016 = 4602^2 + 5496^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (51384427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142555 + ... + 142914.

Almost surely, 2^51384420 is an apocalyptic number.

It is an amenable number.

51384420 is an abundant number, since it is smaller than the sum of its proper divisors (104482200).

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

51384420 is a wasteful number, since it uses less digits than its factorization.

51384420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285484 (or 285479 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 51384420 is about 7168.2926837567. The cubic root of 51384420 is about 371.7724067437.

The spelling of 51384420 in words is "fifty-one million, three hundred eighty-four thousand, four hundred twenty".