51388142 has 32 divisors (see below), whose sum is σ = 86661120. Its totient is φ = 22692960.

The previous prime is 51388121. The next prime is 51388147. The reversal of 51388142 is 24188315.

51388142 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51388142² = 5281482276424328, which contains 22 as substring.

51388142 is a Rhonda number in base 10.

Its product of digits (7680) is a multiple of the sum of its prime divisors (768).

It is a junction number, because it is equal to n+sod(n) for n = 51388099 and 51388108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51388147) 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, 82709 + ... + 83327.

It is an arithmetic number, because the mean of its divisors is an integer number (2708160).

Almost surely, 2^51388142 is an apocalyptic number.

51388142 is a deficient number, since it is larger than the sum of its proper divisors (35272978).

51388142 is a wasteful number, since it uses less digits than its factorization.

51388142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768.

The product of its digits is 7680, while the sum is 32.

The square root of 51388142 is about 7168.5522945711. The cubic root of 51388142 is about 371.7813828982.

The spelling of 51388142 in words is "fifty-one million, three hundred eighty-eight thousand, one hundred forty-two".