1099860390 has 128 divisors (see below), whose sum is σ = 3143992320. Its totient is φ = 272623104.

The previous prime is 1099860389. The next prime is 1099860397. The reversal of 1099860390 is 930689901.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1099860397) 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 63 ways as a sum of consecutive naturals, for example, 379527 + ... + 382413.

It is an arithmetic number, because the mean of its divisors is an integer number (24562440).

Almost surely, 2^1099860390 is an apocalyptic number.

1099860390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1099860390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1571996160).

1099860390 is an abundant number, since it is smaller than the sum of its proper divisors (2044131930).

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

1099860390 is a wasteful number, since it uses less digits than its factorization.

1099860390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3003 (or 2997 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 1099860390 is about 33164.1431368278. The cubic root of 1099860390 is about 1032.2364419035.

The spelling of 1099860390 in words is "one billion, ninety-nine million, eight hundred sixty thousand, three hundred ninety".