51400424 has 16 divisors (see below), whose sum is σ = 96800100. Its totient is φ = 25587072.

The previous prime is 51400421. The next prime is 51400439. The reversal of 51400424 is 42400415.

It can be written as a sum of positive squares in 2 ways, for example, as 47472100 + 3928324 = 6890^2 + 1982^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51400396 and 51400405.

It is not an unprimeable number, because it can be changed into a prime (51400421) 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 in 3 ways as a sum of consecutive naturals, for example, 12197 + ... + 15860.

Almost surely, 2^51400424 is an apocalyptic number.

It is an amenable number.

51400424 is a deficient number, since it is larger than the sum of its proper divisors (45399676).

51400424 is a wasteful number, since it uses less digits than its factorization.

51400424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28292 (or 28288 counting only the distinct ones).

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

The square root of 51400424 is about 7169.4089017157. The cubic root of 51400424 is about 371.8109996868.

Adding to 51400424 its reverse (42400415), we get a palindrome (93800839).

Subtracting from 51400424 its reverse (42400415), we obtain a palindrome (9000009).

The spelling of 51400424 in words is "fifty-one million, four hundred thousand, four hundred twenty-four".