1836521644 has 12 divisors (see below), whose sum is σ = 3214243144. Its totient is φ = 918166464.

The previous prime is 1836521573. The next prime is 1836521647. The reversal of 1836521644 is 4461256381.

It is a happy number.

It is a super-3 number, since 3×1836521644³ (a number of 29 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1836521597 and 1836521606.

It is not an unprimeable number, because it can be changed into a prime (1836521647) 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 3 ways as a sum of consecutive naturals, for example, 38164 + ... + 71620.

Almost surely, 2^1836521644 is an apocalyptic number.

It is an amenable number.

1836521644 is a deficient number, since it is larger than the sum of its proper divisors (1377721500).

1836521644 is a wasteful number, since it uses less digits than its factorization.

1836521644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47184 (or 47182 counting only the distinct ones).

The product of its digits is 138240, while the sum is 40.

The square root of 1836521644 is about 42854.6572031559. The cubic root of 1836521644 is about 1224.6124875076.

The spelling of 1836521644 in words is "one billion, eight hundred thirty-six million, five hundred twenty-one thousand, six hundred forty-four".