51405416 has 16 divisors (see below), whose sum is σ = 102055140. Its totient is φ = 24190720.

The previous prime is 51405413. The next prime is 51405463. The reversal of 51405416 is 61450415.

It can be written as a sum of positive squares in 2 ways, for example, as 50836900 + 568516 = 7130^2 + 754^2 .

It is not an unprimeable number, because it can be changed into a prime (51405413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188855 + ... + 189126.

Almost surely, 2^51405416 is an apocalyptic number.

It is an amenable number.

51405416 is a deficient number, since it is larger than the sum of its proper divisors (50649724).

51405416 is a wasteful number, since it uses less digits than its factorization.

51405416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378004 (or 378000 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 51405416 is about 7169.7570391192. The cubic root of 51405416 is about 371.8230360365.

The spelling of 51405416 in words is "fifty-one million, four hundred five thousand, four hundred sixteen".