51938139 has 16 divisors (see below), whose sum is σ = 76299264. Its totient is φ = 31164000.

The previous prime is 51938137. The next prime is 51938143. The reversal of 51938139 is 93183915.

It is not a de Polignac number, because 51938139 - 2¹ = 51938137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51938097 and 51938106.

It is not an unprimeable number, because it can be changed into a prime (51938137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4459 + ... + 11124.

It is an arithmetic number, because the mean of its divisors is an integer number (4768704).

Almost surely, 2^51938139 is an apocalyptic number.

51938139 is a deficient number, since it is larger than the sum of its proper divisors (24361125).

51938139 is a wasteful number, since it uses less digits than its factorization.

51938139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15698.

The product of its digits is 29160, while the sum is 39.

The square root of 51938139 is about 7206.8119858922. The cubic root of 51938139 is about 373.1030461342.

The spelling of 51938139 in words is "fifty-one million, nine hundred thirty-eight thousand, one hundred thirty-nine".