51993442 has 16 divisors (see below), whose sum is σ = 79486272. Its totient is φ = 25501840.

The previous prime is 51993437. The next prime is 51993449. The reversal of 51993442 is 24439915.

51993442 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 2×51993442² = 5406636022014728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51993449) 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 7 ways as a sum of consecutive naturals, for example, 31428 + ... + 33040.

It is an arithmetic number, because the mean of its divisors is an integer number (4967892).

Almost surely, 2^51993442 is an apocalyptic number.

51993442 is a deficient number, since it is larger than the sum of its proper divisors (27492830).

51993442 is a wasteful number, since it uses less digits than its factorization.

51993442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1913.

The product of its digits is 38880, while the sum is 37.

The square root of 51993442 is about 7210.6478211046. The cubic root of 51993442 is about 373.2354241194.

It can be divided in two parts, 519 and 93442, that added together give a triangular number (93961 = T₄₃₃).

The spelling of 51993442 in words is "fifty-one million, nine hundred ninety-three thousand, four hundred forty-two".