981807940 has 12 divisors (see below), whose sum is σ = 2061796716. Its totient is φ = 392723168.

The previous prime is 981807929. The next prime is 981807973. The reversal of 981807940 is 49708189.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 512479044 + 469328896 = 22638^2 + 21664^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24545179 + ... + 24545218.

It is an arithmetic number, because the mean of its divisors is an integer number (171816393).

Almost surely, 2^981807940 is an apocalyptic number.

It is an amenable number.

981807940 is an abundant number, since it is smaller than the sum of its proper divisors (1079988776).

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

981807940 is a wasteful number, since it uses less digits than its factorization.

981807940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49090406 (or 49090404 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 981807940 is about 31333.8146416934. The cubic root of 981807940 is about 993.8988314461.

The spelling of 981807940 in words is "nine hundred eighty-one million, eight hundred seven thousand, nine hundred forty".