51239424 has 40 divisors (see below), whose sum is σ = 136509120. Its totient is φ = 17079296.

The previous prime is 51239417. The next prime is 51239443. The reversal of 51239424 is 42493215.

It is a junction number, because it is equal to n+sod(n) for n = 51239391 and 51239400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15144 + ... + 18215.

It is an arithmetic number, because the mean of its divisors is an integer number (3412728).

Almost surely, 2^51239424 is an apocalyptic number.

It is an amenable number.

51239424 is an abundant number, since it is smaller than the sum of its proper divisors (85269696).

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

51239424 is an equidigital number, since it uses as much as digits as its factorization.

51239424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33380 (or 33364 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 51239424 is about 7158.1718336458. The cubic root of 51239424 is about 371.4223895280.

The spelling of 51239424 in words is "fifty-one million, two hundred thirty-nine thousand, four hundred twenty-four".