1985121318 has 16 divisors (see below), whose sum is σ = 3994018560. Its totient is φ = 657744456.

The previous prime is 1985121317. The next prime is 1985121337. The reversal of 1985121318 is 8131215891.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985121317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 989578 + ... + 991581.

It is an arithmetic number, because the mean of its divisors is an integer number (249626160).

Almost surely, 2^1985121318 is an apocalyptic number.

1985121318 is an abundant number, since it is smaller than the sum of its proper divisors (2008897242).

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

1985121318 is a wasteful number, since it uses less digits than its factorization.

1985121318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1981331.

The product of its digits is 17280, while the sum is 39.

The square root of 1985121318 is about 44554.7002907662. The cubic root of 1985121318 is about 1256.7889426276.

The spelling of 1985121318 in words is "one billion, nine hundred eighty-five million, one hundred twenty-one thousand, three hundred eighteen".