1985445256 has 16 divisors (see below), whose sum is σ = 3755655900. Its totient is φ = 983937024.

The previous prime is 1985445247. The next prime is 1985445257. The reversal of 1985445256 is 6525445891.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1719429156 + 266016100 = 41466^2 + 16310^2 .

It is not an unprimeable number, because it can be changed into a prime (1985445257) 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, 1097241 + ... + 1099048.

Almost surely, 2^1985445256 is an apocalyptic number.

It is an amenable number.

1985445256 is a deficient number, since it is larger than the sum of its proper divisors (1770210644).

1985445256 is a wasteful number, since it uses less digits than its factorization.

1985445256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2196408 (or 2196404 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 49.

The square root of 1985445256 is about 44558.3354267190. The cubic root of 1985445256 is about 1256.8573010951.

The spelling of 1985445256 in words is "one billion, nine hundred eighty-five million, four hundred forty-five thousand, two hundred fifty-six".