51440347 has 12 divisors (see below), whose sum is σ = 60016896. Its totient is φ = 43960560.

The previous prime is 51440327. The next prime is 51440359. The reversal of 51440347 is 74304415.

It is not a de Polignac number, because 51440347 - 2¹⁹ = 50916059 is a prime.

It is a super-2 number, since 2×51440347² = 5292218598960818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51440327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17397 + ... + 20137.

It is an arithmetic number, because the mean of its divisors is an integer number (5001408).

Almost surely, 2^51440347 is an apocalyptic number.

51440347 is a deficient number, since it is larger than the sum of its proper divisors (8576549).

51440347 is a wasteful number, since it uses less digits than its factorization.

51440347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3138 (or 3131 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 51440347 is about 7172.1926215070. The cubic root of 51440347 is about 371.9072373437.

The spelling of 51440347 in words is "fifty-one million, four hundred forty thousand, three hundred forty-seven".