1982851905 has 16 divisors (see below), whose sum is σ = 3246344640. Its totient is φ = 1032927168.

The previous prime is 1982851903. The next prime is 1982851921. The reversal of 1982851905 is 5091582891.

It is not a de Polignac number, because 1982851905 - 2¹ = 1982851903 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1982851901) 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, 1536450 + ... + 1537739.

It is an arithmetic number, because the mean of its divisors is an integer number (202896540).

Almost surely, 2^1982851905 is an apocalyptic number.

1982851905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1982851905 is a deficient number, since it is larger than the sum of its proper divisors (1263492735).

1982851905 is a wasteful number, since it uses less digits than its factorization.

1982851905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3074240.

The product of its (nonzero) digits is 259200, while the sum is 48.

The square root of 1982851905 is about 44529.2252908132. The cubic root of 1982851905 is about 1256.3098349263.

The spelling of 1982851905 in words is "one billion, nine hundred eighty-two million, eight hundred fifty-one thousand, nine hundred five".