51930390 has 16 divisors (see below), whose sum is σ = 124633008. Its totient is φ = 13848096.

The previous prime is 51930377. The next prime is 51930391. The reversal of 51930390 is 9303915.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 1731013 = 51930390 / (5 + 1 + 9 + 3 + 0 + 3 + 9 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51930391) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 865477 + ... + 865536.

It is an arithmetic number, because the mean of its divisors is an integer number (7789563).

Almost surely, 2^51930390 is an apocalyptic number.

51930390 is an abundant number, since it is smaller than the sum of its proper divisors (72702618).

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

51930390 is a wasteful number, since it uses less digits than its factorization.

51930390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1731023.

The product of its (nonzero) digits is 3645, while the sum is 30.

The square root of 51930390 is about 7206.2743494818. The cubic root of 51930390 is about 373.0844899610.

The spelling of 51930390 in words is "fifty-one million, nine hundred thirty thousand, three hundred ninety".