1640596538 has 12 divisors (see below), whose sum is σ = 2862673722. Its totient is φ = 703112760.

The previous prime is 1640596537. The next prime is 1640596549. The reversal of 1640596538 is 8356950461.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1581414289 + 59182249 = 39767^2 + 7693^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1640596492 and 1640596501.

It is not an unprimeable number, because it can be changed into a prime (1640596537) 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 5 ways as a sum of consecutive naturals, for example, 8370293 + ... + 8370488.

Almost surely, 2^1640596538 is an apocalyptic number.

1640596538 is a deficient number, since it is larger than the sum of its proper divisors (1222077184).

1640596538 is a wasteful number, since it uses less digits than its factorization.

1640596538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16740797 (or 16740790 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 47.

The square root of 1640596538 is about 40504.2780209696. The cubic root of 1640596538 is about 1179.4166747219.

The spelling of 1640596538 in words is "one billion, six hundred forty million, five hundred ninety-six thousand, five hundred thirty-eight".