1640331212 has 24 divisors (see below), whose sum is σ = 3174948336. Its totient is φ = 736613568.

The previous prime is 1640331211. The next prime is 1640331221. The reversal of 1640331212 is 2121330461.

It is a super-2 number, since 2×1640331212² = 5381372970122777888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1640331211) 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, 424358 + ... + 428205.

It is an arithmetic number, because the mean of its divisors is an integer number (132289514).

Almost surely, 2^1640331212 is an apocalyptic number.

It is an amenable number.

1640331212 is a deficient number, since it is larger than the sum of its proper divisors (1534617124).

1640331212 is a wasteful number, since it uses less digits than its factorization.

1640331212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852617 (or 852615 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 1640331212 is about 40501.0026048739. The cubic root of 1640331212 is about 1179.3530907811.

Adding to 1640331212 its reverse (2121330461), we get a palindrome (3761661673).

The spelling of 1640331212 in words is "one billion, six hundred forty million, three hundred thirty-one thousand, two hundred twelve".