51440339 has 8 divisors (see below), whose sum is σ = 51935520. Its totient is φ = 50947776.

The previous prime is 51440327. The next prime is 51440359. The reversal of 51440339 is 93304415.

51440339 = 457² + 458² + ... + 629².

51440339 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51440339 is a prime.

It is a super-2 number, since 2×51440339² = 5292216952869842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51440359) 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, 70394 + ... + 71120.

It is an arithmetic number, because the mean of its divisors is an integer number (6491940).

Almost surely, 2^51440339 is an apocalyptic number.

51440339 is a deficient number, since it is larger than the sum of its proper divisors (495181).

51440339 is a wasteful number, since it uses less digits than its factorization.

51440339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 51440339 is about 7172.1920637975. The cubic root of 51440339 is about 371.9072180641.

The spelling of 51440339 in words is "fifty-one million, four hundred forty thousand, three hundred thirty-nine".