1640143508 has 12 divisors (see below), whose sum is σ = 2897076672. Its totient is φ = 812407320.

The previous prime is 1640143507. The next prime is 1640143513. The reversal of 1640143508 is 8053410461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640143507) by changing a digit.

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, 1915628 + ... + 1916483.

It is an arithmetic number, because the mean of its divisors is an integer number (241423056).

Almost surely, 2^1640143508 is an apocalyptic number.

It is an amenable number.

1640143508 is a deficient number, since it is larger than the sum of its proper divisors (1256933164).

1640143508 is a wasteful number, since it uses less digits than its factorization.

1640143508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3832222 (or 3832220 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 1640143508 is about 40498.6852626107. The cubic root of 1640143508 is about 1179.3081043915.

Adding to 1640143508 its reverse (8053410461), we get a palindrome (9693553969).

The spelling of 1640143508 in words is "one billion, six hundred forty million, one hundred forty-three thousand, five hundred eight".