51840479 has 4 divisors (see below), whose sum is σ = 51863160. Its totient is φ = 51817800.

The previous prime is 51840473. The next prime is 51840491. The reversal of 51840479 is 97404815.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51840479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51840473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7472 + ... + 12629.

It is an arithmetic number, because the mean of its divisors is an integer number (12965790).

Almost surely, 2^51840479 is an apocalyptic number.

51840479 is a deficient number, since it is larger than the sum of its proper divisors (22681).

51840479 is a wasteful number, since it uses less digits than its factorization.

51840479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22680.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 51840479 is about 7200.0332638120. The cubic root of 51840479 is about 372.8690491402.

The spelling of 51840479 in words is "fifty-one million, eight hundred forty thousand, four hundred seventy-nine".