51421838 has 32 divisors (see below), whose sum is σ = 88470144. Its totient is φ = 22205952.

The previous prime is 51421817. The next prime is 51421861. The reversal of 51421838 is 83812415.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139931 + ... + 140297.

It is an arithmetic number, because the mean of its divisors is an integer number (2764692).

Almost surely, 2^51421838 is an apocalyptic number.

51421838 is a deficient number, since it is larger than the sum of its proper divisors (37048306).

51421838 is a wasteful number, since it uses less digits than its factorization.

51421838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716.

The product of its digits is 7680, while the sum is 32.

The square root of 51421838 is about 7170.9021747616. The cubic root of 51421838 is about 371.8626260789.

The spelling of 51421838 in words is "fifty-one million, four hundred twenty-one thousand, eight hundred thirty-eight".