51222390 has 16 divisors (see below), whose sum is σ = 122933808. Its totient is φ = 13659296.

The previous prime is 51222389. The next prime is 51222397. The reversal of 51222390 is 9322215.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51222390.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51222397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 853677 + ... + 853736.

It is an arithmetic number, because the mean of its divisors is an integer number (7683363).

Almost surely, 2^51222390 is an apocalyptic number.

51222390 is an abundant number, since it is smaller than the sum of its proper divisors (71711418).

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

51222390 is a wasteful number, since it uses less digits than its factorization.

51222390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1707423.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 51222390 is about 7156.9819058036. The cubic root of 51222390 is about 371.3812264956.

The spelling of 51222390 in words is "fifty-one million, two hundred twenty-two thousand, three hundred ninety".