51837440 has 40 divisors (see below), whose sum is σ = 124294500. Its totient is φ = 20733952.

The previous prime is 51837439. The next prime is 51837451. The reversal of 51837440 is 4473815.

It can be written as a sum of positive squares in 2 ways, for example, as 50239744 + 1597696 = 7088^2 + 1264^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 51837397 and 51837406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7565 + ... + 12684.

Almost surely, 2^51837440 is an apocalyptic number.

It is an amenable number.

51837440 is an abundant number, since it is smaller than the sum of its proper divisors (72457060).

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

51837440 is an equidigital number, since it uses as much as digits as its factorization.

51837440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20272 (or 20256 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 51837440 is about 7199.8222200274. The cubic root of 51837440 is about 372.8617628702.

The spelling of 51837440 in words is "fifty-one million, eight hundred thirty-seven thousand, four hundred forty".