1986894722 has 18 divisors (see below), whose sum is σ = 3055432617. Its totient is φ = 969020136.

The previous prime is 1986894683. The next prime is 1986894751. The reversal of 1986894722 is 2274986891.

It can be written as a sum of positive squares in 2 ways, for example, as 1283000761 + 703893961 = 35819^2 + 26531^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=31519.

It is a super-2 number, since 2×1986894722² = 7895501272622914568, which contains 22 as substring.

It is a Duffinian 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 8 ways as a sum of consecutive naturals, for example, 2710268 + ... + 2711000.

Almost surely, 2^1986894722 is an apocalyptic number.

1986894722 is a deficient number, since it is larger than the sum of its proper divisors (1068537895).

1986894722 is an frugal number, since it uses more digits than its factorization.

1986894722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1554 (or 778 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 56.

The square root of 1986894722 is about 44574.5972724376. The cubic root of 1986894722 is about 1257.1630811669.

The spelling of 1986894722 in words is "one billion, nine hundred eighty-six million, eight hundred ninety-four thousand, seven hundred twenty-two".