1105721456 has 90 divisors (see below), whose sum is σ = 2557414440. Its totient is φ = 461771520.

The previous prime is 1105721413. The next prime is 1105721459. The reversal of 1105721456 is 6541275011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1105721459) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1317485 + ... + 1318323.

It is an arithmetic number, because the mean of its divisors is an integer number (28415716).

Almost surely, 2^1105721456 is an apocalyptic number.

1105721456 is a gapful number since it is divisible by the number (16) 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 1105721456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1278707220).

1105721456 is an abundant number, since it is smaller than the sum of its proper divisors (1451692984).

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

1105721456 is an equidigital number, since it uses as much as digits as its factorization.

1105721456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943 (or 889 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 32.

The square root of 1105721456 is about 33252.3902298767. The cubic root of 1105721456 is about 1034.0667623725.

Adding to 1105721456 its reverse (6541275011), we get a palindrome (7646996467).

The spelling of 1105721456 in words is "one billion, one hundred five million, seven hundred twenty-one thousand, four hundred fifty-six".