1899221636 has 12 divisors (see below), whose sum is σ = 3579302412. Its totient is φ = 876563808.

The previous prime is 1899221617. The next prime is 1899221659. The reversal of 1899221636 is 6361229981.

It can be written as a sum of positive squares in 2 ways, for example, as 1239040000 + 660181636 = 35200^2 + 25694^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18261695 + ... + 18261798.

It is an arithmetic number, because the mean of its divisors is an integer number (298275201).

Almost surely, 2^1899221636 is an apocalyptic number.

It is an amenable number.

1899221636 is a deficient number, since it is larger than the sum of its proper divisors (1680080776).

1899221636 is a wasteful number, since it uses less digits than its factorization.

1899221636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36523510 (or 36523508 counting only the distinct ones).

The product of its digits is 279936, while the sum is 47.

The square root of 1899221636 is about 43580.0600733868. The cubic root of 1899221636 is about 1238.3931745415.

The spelling of 1899221636 in words is "one billion, eight hundred ninety-nine million, two hundred twenty-one thousand, six hundred thirty-six".