51486440 has 32 divisors (see below), whose sum is σ = 117749160. Its totient is φ = 20256000.

The previous prime is 51486439. The next prime is 51486451. The reversal of 51486440 is 4468415.

51486440 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 19518724 + 31967716 = 4418^2 + 5654^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51486397 and 51486406.

It is an unprimeable number.

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, 8111 + ... + 12990.

Almost surely, 2^51486440 is an apocalyptic number.

It is an amenable number.

51486440 is an abundant number, since it is smaller than the sum of its proper divisors (66262720).

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

51486440 is a wasteful number, since it uses less digits than its factorization.

51486440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21173 (or 21169 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 51486440 is about 7175.4052150384. The cubic root of 51486440 is about 372.0182863790.

The spelling of 51486440 in words is "fifty-one million, four hundred eighty-six thousand, four hundred forty".