1985838974 has 64 divisors (see below), whose sum is σ = 3620592000. Its totient is φ = 815560704.

The previous prime is 1985838961. The next prime is 1985838989. The reversal of 1985838974 is 4798385891.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3441374 + ... + 3441950.

It is an arithmetic number, because the mean of its divisors is an integer number (56571750).

Almost surely, 2^1985838974 is an apocalyptic number.

1985838974 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1985838974 is a deficient number, since it is larger than the sum of its proper divisors (1634753026).

1985838974 is a wasteful number, since it uses less digits than its factorization.

1985838974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802 (or 788 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 62.

The square root of 1985838974 is about 44562.7532138668. The cubic root of 1985838974 is about 1256.9403747592.

The spelling of 1985838974 in words is "one billion, nine hundred eighty-five million, eight hundred thirty-eight thousand, nine hundred seventy-four".