51943940 has 24 divisors (see below), whose sum is σ = 110873112. Its totient is φ = 20436480.

The previous prime is 51943939. The next prime is 51943949. The reversal of 51943940 is 4934915.

It can be written as a sum of positive squares in 4 ways, for example, as 3474496 + 48469444 = 1864^2 + 6962^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51943940.

It is not an unprimeable number, because it can be changed into a prime (51943949) 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, 20069 + ... + 22508.

It is an arithmetic number, because the mean of its divisors is an integer number (4619713).

Almost surely, 2^51943940 is an apocalyptic number.

It is an amenable number.

51943940 is an abundant number, since it is smaller than the sum of its proper divisors (58929172).

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

51943940 is a wasteful number, since it uses less digits than its factorization.

51943940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42647 (or 42645 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 51943940 is about 7207.2144411000. The cubic root of 51943940 is about 373.1169363135.

The spelling of 51943940 in words is "fifty-one million, nine hundred forty-three thousand, nine hundred forty".