1638540682 has 16 divisors (see below), whose sum is σ = 2633746752. Its totient is φ = 761786560.

The previous prime is 1638540653. The next prime is 1638540689. The reversal of 1638540682 is 2860458361.

It is not an unprimeable number, because it can be changed into a prime (1638540689) 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 7 ways as a sum of consecutive naturals, for example, 287494 + ... + 293137.

It is an arithmetic number, because the mean of its divisors is an integer number (164609172).

Almost surely, 2^1638540682 is an apocalyptic number.

1638540682 is a deficient number, since it is larger than the sum of its proper divisors (995206070).

1638540682 is a wasteful number, since it uses less digits than its factorization.

1638540682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580733.

The product of its (nonzero) digits is 276480, while the sum is 43.

The square root of 1638540682 is about 40478.8918079534. The cubic root of 1638540682 is about 1178.9238205861.

The spelling of 1638540682 in words is "one billion, six hundred thirty-eight million, five hundred forty thousand, six hundred eighty-two".