51840904 has 8 divisors (see below), whose sum is σ = 97201710. Its totient is φ = 25920448.

The previous prime is 51840883. The next prime is 51840907. The reversal of 51840904 is 40904815.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 50836900 + 1004004 = 7130^2 + 1002^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (51840907) by changing a digit.

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 as a sum of consecutive naturals, namely, 3240049 + ... + 3240064.

Almost surely, 2^51840904 is an apocalyptic number.

It is an amenable number.

51840904 is a deficient number, since it is larger than the sum of its proper divisors (45360806).

51840904 is a wasteful number, since it uses less digits than its factorization.

51840904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6480119 (or 6480115 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 51840904 is about 7200.0627775041. The cubic root of 51840904 is about 372.8700680924.

The spelling of 51840904 in words is "fifty-one million, eight hundred forty thousand, nine hundred four".