51905238 has 32 divisors (see below), whose sum is σ = 129427200. Its totient is φ = 13481760.

The previous prime is 51905209. The next prime is 51905239. The reversal of 51905238 is 83250915.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 51905199 and 51905208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51905239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55713 + ... + 56636.

It is an arithmetic number, because the mean of its divisors is an integer number (4044600).

Almost surely, 2^51905238 is an apocalyptic number.

51905238 is an abundant number, since it is smaller than the sum of its proper divisors (77521962).

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

51905238 is a wasteful number, since it uses less digits than its factorization.

51905238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112372.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 51905238 is about 7204.5289922381. The cubic root of 51905238 is about 373.0242469030.

The spelling of 51905238 in words is "fifty-one million, nine hundred five thousand, two hundred thirty-eight".