640001222 has 8 divisors (see below), whose sum is σ = 1097144976. Its totient is φ = 274286232.

The previous prime is 640001183. The next prime is 640001249. The reversal of 640001222 is 222100046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×640001222² = 819203128322986568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 640001222.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22857173 + ... + 22857200.

It is an arithmetic number, because the mean of its divisors is an integer number (137143122).

Almost surely, 2^640001222 is an apocalyptic number.

640001222 is a deficient number, since it is larger than the sum of its proper divisors (457143754).

640001222 is a wasteful number, since it uses less digits than its factorization.

640001222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45714382.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 640001222 is about 25298.2454332311. The cubic root of 640001222 is about 861.7744244956.

Adding to 640001222 its reverse (222100046), we get a palindrome (862101268).

The spelling of 640001222 in words is "six hundred forty million, one thousand, two hundred twenty-two".