51406372 has 6 divisors (see below), whose sum is σ = 89961158. Its totient is φ = 25703184.

The previous prime is 51406367. The next prime is 51406379. The reversal of 51406372 is 27360415.

It can be written as a sum of positive squares in only one way, i.e., 51065316 + 341056 = 7146^2 + 584^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51406372.

It is not an unprimeable number, because it can be changed into a prime (51406379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6425793 + ... + 6425800.

Almost surely, 2^51406372 is an apocalyptic number.

It is an amenable number.

51406372 is a deficient number, since it is larger than the sum of its proper divisors (38554786).

51406372 is a wasteful number, since it uses less digits than its factorization.

51406372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12851597 (or 12851595 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 51406372 is about 7169.8237077351. The cubic root of 51406372 is about 371.8253409857.

Adding to 51406372 its reverse (27360415), we get a palindrome (78766787).

The spelling of 51406372 in words is "fifty-one million, four hundred six thousand, three hundred seventy-two".