1001099904 has 128 divisors (see below), whose sum is σ = 3063329280. Its totient is φ = 283745280.

The previous prime is 1001099903. The next prime is 1001099971. The reversal of 1001099904 is 4099901001.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (1001099903) 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, 350707 + ... + 353549.

It is an arithmetic number, because the mean of its divisors is an integer number (23932260).

Almost surely, 2^1001099904 is an apocalyptic number.

1001099904 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1001099904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1531664640).

1001099904 is an abundant number, since it is smaller than the sum of its proper divisors (2062229376).

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

1001099904 is a wasteful number, since it uses less digits than its factorization.

1001099904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2998 (or 2986 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 1001099904 is about 31640.1628314394. The cubic root of 1001099904 is about 1000.3665003278.

The spelling of 1001099904 in words is "one billion, one million, ninety-nine thousand, nine hundred four".