1985486557 has 4 divisors (see below), whose sum is σ = 2003702140. Its totient is φ = 1967270976.

The previous prime is 1985486551. The next prime is 1985486561. The reversal of 1985486557 is 7556845891.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 549152356 + 1436334201 = 23434^2 + 37899^2 .

It is a cyclic number.

It is not a de Polignac number, because 1985486557 - 2³ = 1985486549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985486551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9107628 + ... + 9107845.

It is an arithmetic number, because the mean of its divisors is an integer number (500925535).

Almost surely, 2^1985486557 is an apocalyptic number.

It is an amenable number.

1985486557 is a deficient number, since it is larger than the sum of its proper divisors (18215583).

1985486557 is a wasteful number, since it uses less digits than its factorization.

1985486557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18215582.

The product of its digits is 12096000, while the sum is 58.

The square root of 1985486557 is about 44558.7988729499. The cubic root of 1985486557 is about 1256.8660160342.

The spelling of 1985486557 in words is "one billion, nine hundred eighty-five million, four hundred eighty-six thousand, five hundred fifty-seven".