51918393 has 8 divisors (see below), whose sum is σ = 72868000. Its totient is φ = 32790528.

The previous prime is 51918371. The next prime is 51918401. The reversal of 51918393 is 39381915.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51918393 - 2¹⁸ = 51656249 is a prime.

It is a super-3 number, since 3×51918393³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51918353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 455368 + ... + 455481.

It is an arithmetic number, because the mean of its divisors is an integer number (9108500).

Almost surely, 2^51918393 is an apocalyptic number.

It is an amenable number.

51918393 is a deficient number, since it is larger than the sum of its proper divisors (20949607).

51918393 is a wasteful number, since it uses less digits than its factorization.

51918393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910871.

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

The square root of 51918393 is about 7205.4419017851. The cubic root of 51918393 is about 373.0557576564.

The spelling of 51918393 in words is "fifty-one million, nine hundred eighteen thousand, three hundred ninety-three".