51240404 has 24 divisors (see below), whose sum is σ = 91045920. Its totient is φ = 25230816.

The previous prime is 51240383. The next prime is 51240407. The reversal of 51240404 is 40404215.

51240404 = T₄₇ + T₄₈ + ... + T₆₇₄.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51240407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86999 + ... + 87585.

It is an arithmetic number, because the mean of its divisors is an integer number (3793580).

Almost surely, 2^51240404 is an apocalyptic number.

It is an amenable number.

51240404 is a deficient number, since it is larger than the sum of its proper divisors (39805516).

51240404 is a wasteful number, since it uses less digits than its factorization.

51240404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887 (or 885 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 51240404 is about 7158.2402865509. The cubic root of 51240404 is about 371.4247574418.

Adding to 51240404 its reverse (40404215), we get a palindrome (91644619).

The spelling of 51240404 in words is "fifty-one million, two hundred forty thousand, four hundred four".