1985481228 has 54 divisors (see below), whose sum is σ = 4896686676. Its totient is φ = 626067936.

The previous prime is 1985481227. The next prime is 1985481271. The reversal of 1985481228 is 8221845891.

It is not an unprimeable number, because it can be changed into a prime (1985481227) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2932426 + ... + 2933102.

Almost surely, 2^1985481228 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1985481228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2448343338).

1985481228 is an abundant number, since it is smaller than the sum of its proper divisors (2911205448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1985481228 is an equidigital number, since it uses as much as digits as its factorization.

1985481228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399 (or 701 counting only the distinct ones).

The product of its digits is 368640, while the sum is 48.

The square root of 1985481228 is about 44558.7390755169. The cubic root of 1985481228 is about 1256.8648915668.

Multiplying 1985481228 by its sum of digits (48), we get a square (95303098944 = 308712²).

The spelling of 1985481228 in words is "one billion, nine hundred eighty-five million, four hundred eighty-one thousand, two hundred twenty-eight".