51405738 has 16 divisors (see below), whose sum is σ = 102918816. Its totient is φ = 17117360.

The previous prime is 51405721. The next prime is 51405749. The reversal of 51405738 is 83750415.

It is a junction number, because it is equal to n+sod(n) for n = 51405699 and 51405708.

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 7 ways as a sum of consecutive naturals, for example, 2620 + ... + 10472.

It is an arithmetic number, because the mean of its divisors is an integer number (6432426).

Almost surely, 2^51405738 is an apocalyptic number.

51405738 is an abundant number, since it is smaller than the sum of its proper divisors (51513078).

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

51405738 is a wasteful number, since it uses less digits than its factorization.

51405738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8949.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 51405738 is about 7169.7794945172. The cubic root of 51405738 is about 371.8238123928.

It can be divided in two parts, 5140 and 5738, that added together give a triangular number (10878 = T₁₄₇).

The spelling of 51405738 in words is "fifty-one million, four hundred five thousand, seven hundred thirty-eight".