1648684538 has 16 divisors (see below), whose sum is σ = 2557953216. Its totient is φ = 796424160.

The previous prime is 1648684537. The next prime is 1648684559. The reversal of 1648684538 is 8354868461.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1648684538.

It is not an unprimeable number, because it can be changed into a prime (1648684537) 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, 89156 + ... + 106047.

It is an arithmetic number, because the mean of its divisors is an integer number (159872076).

Almost surely, 2^1648684538 is an apocalyptic number.

1648684538 is a deficient number, since it is larger than the sum of its proper divisors (909268678).

1648684538 is a wasteful number, since it uses less digits than its factorization.

1648684538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195349.

The product of its digits is 4423680, while the sum is 53.

The square root of 1648684538 is about 40603.9965766918. The cubic root of 1648684538 is about 1181.3516394239.

It can be divided in two parts, 164868453 and 8, that added together give a palindrome (164868461).

The spelling of 1648684538 in words is "one billion, six hundred forty-eight million, six hundred eighty-four thousand, five hundred thirty-eight".