1986189448 has 8 divisors (see below), whose sum is σ = 3724105230. Its totient is φ = 993094720.

The previous prime is 1986189427. The next prime is 1986189451. The reversal of 1986189448 is 8449816891.

It can be written as a sum of positive squares in only one way, i.e., 1925629924 + 60559524 = 43882^2 + 7782^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 1986189392 and 1986189401.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124136833 + ... + 124136848.

Almost surely, 2^1986189448 is an apocalyptic number.

It is an amenable number.

1986189448 is a deficient number, since it is larger than the sum of its proper divisors (1737915782).

1986189448 is a wasteful number, since it uses less digits than its factorization.

1986189448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248273687 (or 248273683 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 58.

The square root of 1986189448 is about 44566.6854051319. The cubic root of 1986189448 is about 1257.0143147939.

The spelling of 1986189448 in words is "one billion, nine hundred eighty-six million, one hundred eighty-nine thousand, four hundred forty-eight".