1099806840 has 432 divisors, whose sum is σ = 4280108040. Its totient is φ = 242841600.

The previous prime is 1099806821. The next prime is 1099806859. The reversal of 1099806840 is 486089901.

It is an interprime number because it is at equal distance from previous prime (1099806821) and next prime (1099806859).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 35477625 + ... + 35477655.

Almost surely, 2^1099806840 is an apocalyptic number.

1099806840 is a gapful number since it is divisible by the number (10) 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 1099806840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2140054020).

1099806840 is an abundant number, since it is smaller than the sum of its proper divisors (3180301200).

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

1099806840 is a wasteful number, since it uses less digits than its factorization.

1099806840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124 (or 69 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 1099806840 is about 33163.3357791402. The cubic root of 1099806840 is about 1032.2196891232.

The spelling of 1099806840 in words is "one billion, ninety-nine million, eight hundred six thousand, eight hundred forty".