1838565640404 has 36 divisors (see below), whose sum is σ = 4647692733684. Its totient is φ = 612827868672.

The previous prime is 1838565640381. The next prime is 1838565640411. The reversal of 1838565640404 is 4040465658381.

1838565640404 is a `hidden beast` number, since 1 + 8 + 38 + 5 + 6 + 564 + 0 + 40 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 961537136400 + 877028504004 = 980580^2 + 936498^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1838565640404² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 313117 + ... + 1942980.

Almost surely, 2^{1838565640404} is an apocalyptic number.

It is an amenable number.

1838565640404 is an abundant number, since it is smaller than the sum of its proper divisors (2809127093280).

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

1838565640404 is a wasteful number, since it uses less digits than its factorization.

1838565640404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2278744 (or 2278739 counting only the distinct ones).

The product of its (nonzero) digits is 11059200, while the sum is 54.

The spelling of 1838565640404 in words is "one trillion, eight hundred thirty-eight billion, five hundred sixty-five million, six hundred forty thousand, four hundred four".