51254240 has 24 divisors (see below), whose sum is σ = 121088520. Its totient is φ = 20501632.

The previous prime is 51254239. The next prime is 51254257. The reversal of 51254240 is 4245215.

It is a happy number.

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, 160010 + ... + 160329.

It is an arithmetic number, because the mean of its divisors is an integer number (5045355).

Almost surely, 2^51254240 is an apocalyptic number.

It is an amenable number.

51254240 is an abundant number, since it is smaller than the sum of its proper divisors (69834280).

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

51254240 is a wasteful number, since it uses less digits than its factorization.

51254240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320354 (or 320346 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 51254240 is about 7159.2066599589. The cubic root of 51254240 is about 371.4581852973.

Adding to 51254240 its reverse (4245215), we get a palindrome (55499455).

The spelling of 51254240 in words is "fifty-one million, two hundred fifty-four thousand, two hundred forty".