981555240 has 64 divisors (see below), whose sum is σ = 3024264960. Its totient is φ = 254672640.

The previous prime is 981555233. The next prime is 981555241. The reversal of 981555240 is 42555189.

It is not an unprimeable number, because it can be changed into a prime (981555241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106096 + ... + 114975.

It is an arithmetic number, because the mean of its divisors is an integer number (47254140).

Almost surely, 2^981555240 is an apocalyptic number.

It is an amenable number.

981555240 is an abundant number, since it is smaller than the sum of its proper divisors (2042709720).

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

981555240 is a wasteful number, since it uses less digits than its factorization.

981555240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221122 (or 221118 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 39.

The square root of 981555240 is about 31329.7819973264. The cubic root of 981555240 is about 993.8135534688.

The spelling of 981555240 in words is "nine hundred eighty-one million, five hundred fifty-five thousand, two hundred forty".