8400222781 has 4 divisors (see below), whose sum is σ = 8401453632. Its totient is φ = 8398991932.

The previous prime is 8400222751. The next prime is 8400222793. The reversal of 8400222781 is 1872220048.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8400222781 - 2⁷ = 8400222653 is a prime.

It is a super-2 number, since 2×8400222781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8400222751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 605131 + ... + 618856.

It is an arithmetic number, because the mean of its divisors is an integer number (2100363408).

Almost surely, 2^8400222781 is an apocalyptic number.

It is an amenable number.

8400222781 is a deficient number, since it is larger than the sum of its proper divisors (1230851).

8400222781 is a wasteful number, since it uses less digits than its factorization.

8400222781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1230850.

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 8400222781 is about 91652.7292610537. The cubic root of 8400222781 is about 2032.8106844071.

The spelling of 8400222781 in words is "eight billion, four hundred million, two hundred twenty-two thousand, seven hundred eighty-one".