51043240 has 32 divisors (see below), whose sum is σ = 117019080. Its totient is φ = 20031232.

The previous prime is 51043229. The next prime is 51043247. The reversal of 51043240 is 4234015.

51043240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 50722884 + 320356 = 7122^2 + 566^2 .

It is not an unprimeable number, because it can be changed into a prime (51043247) 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, 9919 + ... + 14158.

Almost surely, 2^51043240 is an apocalyptic number.

It is an amenable number.

51043240 is an abundant number, since it is smaller than the sum of its proper divisors (65975840).

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

51043240 is a wasteful number, since it uses less digits than its factorization.

51043240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24141 (or 24137 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 51043240 is about 7144.4551926651. The cubic root of 51043240 is about 370.9477528787.

Adding to 51043240 its reverse (4234015), we get a palindrome (55277255).

The spelling of 51043240 in words is "fifty-one million, forty-three thousand, two hundred forty".