1985081380 has 48 divisors (see below), whose sum is σ = 4196344320. Its totient is φ = 788784128.

The previous prime is 1985081303. The next prime is 1985081389. The reversal of 1985081380 is 831805891.

It is not an unprimeable number, because it can be changed into a prime (1985081389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3381447 + ... + 3382033.

It is an arithmetic number, because the mean of its divisors is an integer number (87423840).

Almost surely, 2^1985081380 is an apocalyptic number.

1985081380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1985081380 is an abundant number, since it is smaller than the sum of its proper divisors (2211262940).

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

1985081380 is a wasteful number, since it uses less digits than its factorization.

1985081380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1428 (or 1426 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 43.

The square root of 1985081380 is about 44554.2520978638. The cubic root of 1985081380 is about 1256.7805142639.

The spelling of 1985081380 in words is "one billion, nine hundred eighty-five million, eighty-one thousand, three hundred eighty".