1099281640 has 32 divisors (see below), whose sum is σ = 2508226560. Its totient is φ = 433518400.

The previous prime is 1099281593. The next prime is 1099281641. The reversal of 1099281640 is 461829901.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 1099281593 and 1099281602.

It is not an unprimeable number, because it can be changed into a prime (1099281641) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 190696 + ... + 196375.

It is an arithmetic number, because the mean of its divisors is an integer number (78382080).

Almost surely, 2^1099281640 is an apocalyptic number.

1099281640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1099281640 is an abundant number, since it is smaller than the sum of its proper divisors (1408944920).

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

1099281640 is a wasteful number, since it uses less digits than its factorization.

1099281640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387153 (or 387149 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 1099281640 is about 33155.4164504082. The cubic root of 1099281640 is about 1032.0553547817.

The spelling of 1099281640 in words is "one billion, ninety-nine million, two hundred eighty-one thousand, six hundred forty".