1985020308 has 36 divisors (see below), whose sum is σ = 5102741280. Its totient is φ = 650457936.

The previous prime is 1985020277. The next prime is 1985020327. The reversal of 1985020308 is 8030205891.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 465160 + ... + 469407.

Almost surely, 2^1985020308 is an apocalyptic number.

1985020308 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1985020308 is an abundant number, since it is smaller than the sum of its proper divisors (3117720972).

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

1985020308 is a wasteful number, since it uses less digits than its factorization.

1985020308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934636 (or 934631 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 1985020308 is about 44553.5667259087. The cubic root of 1985020308 is about 1256.7676256426.

The spelling of 1985020308 in words is "one billion, nine hundred eighty-five million, twenty thousand, three hundred eight".