51974638 has 4 divisors (see below), whose sum is σ = 77961960. Its totient is φ = 25987318.

The previous prime is 51974617. The next prime is 51974651. The reversal of 51974638 is 83647915.

51974638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 51974594 and 51974603.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 12993658 + ... + 12993661.

It is an arithmetic number, because the mean of its divisors is an integer number (19490490).

Almost surely, 2^51974638 is an apocalyptic number.

51974638 is a deficient number, since it is larger than the sum of its proper divisors (25987322).

51974638 is a wasteful number, since it uses less digits than its factorization.

51974638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25987321.

The product of its digits is 181440, while the sum is 43.

The square root of 51974638 is about 7209.3437981553. The cubic root of 51974638 is about 373.1904237956.

It can be divided in two parts, 519 and 74638, that added together give a palindrome (75157).

The spelling of 51974638 in words is "fifty-one million, nine hundred seventy-four thousand, six hundred thirty-eight".