1985671424 has 72 divisors (see below), whose sum is σ = 4356319968. Its totient is φ = 895815680.

The previous prime is 1985671411. The next prime is 1985671469. The reversal of 1985671424 is 4241765891.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 383219 + ... + 388365.

It is an arithmetic number, because the mean of its divisors is an integer number (60504444).

Almost surely, 2^1985671424 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 1985671424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2178159984).

1985671424 is an abundant number, since it is smaller than the sum of its proper divisors (2370648544).

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

1985671424 is a wasteful number, since it uses less digits than its factorization.

1985671424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5311 (or 5297 counting only the distinct ones).

The product of its digits is 483840, while the sum is 47.

The square root of 1985671424 is about 44560.8732409947. The cubic root of 1985671424 is about 1256.9050234063.

It can be divided in two parts, 198567 and 1424, that added together give a palindrome (199991).

The spelling of 1985671424 in words is "one billion, nine hundred eighty-five million, six hundred seventy-one thousand, four hundred twenty-four".