51143440 has 40 divisors (see below), whose sum is σ = 125170560. Its totient is φ = 19380096.

The previous prime is 51143431. The next prime is 51143447. The reversal of 51143440 is 4434115.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (51143447) 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, 15304 + ... + 18343.

It is an arithmetic number, because the mean of its divisors is an integer number (3129264).

Almost surely, 2^51143440 is an apocalyptic number.

It is an amenable number.

51143440 is an abundant number, since it is smaller than the sum of its proper divisors (74027120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51143440 is a wasteful number, since it uses less digits than its factorization.

51143440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33679 (or 33673 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 51143440 is about 7151.4641857455. The cubic root of 51143440 is about 371.1903228378.

Adding to 51143440 its reverse (4434115), we get a palindrome (55577555).

The spelling of 51143440 in words is "fifty-one million, one hundred forty-three thousand, four hundred forty".