640340122 has 8 divisors (see below), whose sum is σ = 1017010836. Its totient is φ = 301336512.

The previous prime is 640340111. The next prime is 640340131. The reversal of 640340122 is 221043046.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 636502441 + 3837681 = 25229^2 + 1959^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 640340093 and 640340102.

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, 9416733 + ... + 9416800.

Almost surely, 2^640340122 is an apocalyptic number.

640340122 is a deficient number, since it is larger than the sum of its proper divisors (376670714).

640340122 is a wasteful number, since it uses less digits than its factorization.

640340122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18833552.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 640340122 is about 25304.9426397295. The cubic root of 640340122 is about 861.9265095265.

Adding to 640340122 its reverse (221043046), we get a palindrome (861383168).

The spelling of 640340122 in words is "six hundred forty million, three hundred forty thousand, one hundred twenty-two".