640934141 has 8 divisors (see below), whose sum is σ = 654462720. Its totient is φ = 627458832.

The previous prime is 640934117. The next prime is 640934171. The reversal of 640934141 is 141439046.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640934141 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640934098 and 640934107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640934171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11480 + ... + 37598.

It is an arithmetic number, because the mean of its divisors is an integer number (81807840).

Almost surely, 2^640934141 is an apocalyptic number.

It is an amenable number.

640934141 is a deficient number, since it is larger than the sum of its proper divisors (13528579).

640934141 is a wasteful number, since it uses less digits than its factorization.

640934141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26635.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 640934141 is about 25316.6771318828. The cubic root of 640934141 is about 862.1929525547.

The spelling of 640934141 in words is "six hundred forty million, nine hundred thirty-four thousand, one hundred forty-one".