1986126057 has 12 divisors (see below), whose sum is σ = 2869370244. Its totient is φ = 1323843360.

The previous prime is 1986126029. The next prime is 1986126217. The reversal of 1986126057 is 7506216891.

It can be written as a sum of positive squares in 2 ways, for example, as 1029832281 + 956293776 = 32091^2 + 30924^2 .

It is not a de Polignac number, because 1986126057 - 2¹⁰ = 1986125033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1986126557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42463 + ... + 75995.

It is an arithmetic number, because the mean of its divisors is an integer number (239114187).

Almost surely, 2^1986126057 is an apocalyptic number.

It is an amenable number.

1986126057 is a deficient number, since it is larger than the sum of its proper divisors (883244187).

1986126057 is a wasteful number, since it uses less digits than its factorization.

1986126057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40120 (or 40117 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 1986126057 is about 44565.9742067870. The cubic root of 1986126057 is about 1257.0009417422. Note that the first 3 decimals are identical.

The spelling of 1986126057 in words is "one billion, nine hundred eighty-six million, one hundred twenty-six thousand, fifty-seven".