1982851906 has 32 divisors (see below), whose sum is σ = 3470802048. Its totient is φ = 832070400.

The previous prime is 1982851903. The next prime is 1982851921. The reversal of 1982851906 is 6091582891.

It is a super-2 number, since 2×1982851906² = 7863403362255665672, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1982851906.

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, 123756 + ... + 138856.

It is an arithmetic number, because the mean of its divisors is an integer number (108462564).

Almost surely, 2^1982851906 is an apocalyptic number.

1982851906 is a deficient number, since it is larger than the sum of its proper divisors (1487950142).

1982851906 is a wasteful number, since it uses less digits than its factorization.

1982851906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15306.

The product of its (nonzero) digits is 311040, while the sum is 49.

The square root of 1982851906 is about 44529.2253020418. The cubic root of 1982851906 is about 1256.3098351375.

The spelling of 1982851906 in words is "one billion, nine hundred eighty-two million, eight hundred fifty-one thousand, nine hundred six".