1918965636 has 135 divisors (see below), whose sum is σ = 5697068741. Its totient is φ = 544596192.

The previous prime is 1918965613. The next prime is 1918965649. The reversal of 1918965636 is 6365698191.

The square root of 1918965636 is 43806.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 224820036 + 1694145600 = 14994^2 + 41160^2 .

It is a super-2 number, since 2×1918965636² = 7364858224297768992, which contains 22 as substring.

It is an unprimeable number.

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 44 ways as a sum of consecutive naturals, for example, 12878890 + ... + 12879038.

Almost surely, 2^1918965636 is an apocalyptic number.

1918965636 is the 43806-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1918965636

1918965636 is an abundant number, since it is smaller than the sum of its proper divisors (3778103105).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1918965636 is an equidigital number, since it uses as much as digits as its factorization.

1918965636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336 (or 161 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The cubic root of 1918965636 is about 1242.6697671886.

The spelling of 1918965636 in words is "one billion, nine hundred eighteen million, nine hundred sixty-five thousand, six hundred thirty-six".