51538390 has 32 divisors (see below), whose sum is σ = 98902944. Its totient is φ = 19269120.

The previous prime is 51538363. The next prime is 51538391. The reversal of 51538390 is 9383515.

51538390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51538391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25725 + ... + 27655.

It is an arithmetic number, because the mean of its divisors is an integer number (3090717).

Almost surely, 2^51538390 is an apocalyptic number.

51538390 is a deficient number, since it is larger than the sum of its proper divisors (47364554).

51538390 is a wasteful number, since it uses less digits than its factorization.

51538390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 51538390 is about 7179.0243069654. The cubic root of 51538390 is about 372.1433669083.

The spelling of 51538390 in words is "fifty-one million, five hundred thirty-eight thousand, three hundred ninety".