1985013100 has 36 divisors (see below), whose sum is σ = 4922834224. Its totient is φ = 680575680.

The previous prime is 1985013097. The next prime is 1985013103. The reversal of 1985013100 is 13105891.

It is an interprime number because it is at equal distance from previous prime (1985013097) and next prime (1985013103).

It is a super-2 number, since 2×1985013100² = 7880554014343220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (1985013103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1417167 + ... + 1418566.

Almost surely, 2^1985013100 is an apocalyptic number.

1985013100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1985013100 is an abundant number, since it is smaller than the sum of its proper divisors (2937821124).

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

1985013100 is a wasteful number, since it uses less digits than its factorization.

1985013100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2835754 (or 2835747 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 1985013100 is about 44553.4858344440. The cubic root of 1985013100 is about 1256.7661044504.

Adding to 1985013100 its reverse (13105891), we get a palindrome (1998118991).

It can be divided in two parts, 198501 and 3100, that added together give a square (201601 = 449²).

The spelling of 1985013100 in words is "one billion, nine hundred eighty-five million, thirteen thousand, one hundred".