1081901440 has 64 divisors (see below), whose sum is σ = 2649568320. Its totient is φ = 422195200.

The previous prime is 1081901419. The next prime is 1081901441. The reversal of 1081901440 is 441091801.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 1081901399 and 1081901408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081901441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5625 + ... + 46855.

It is an arithmetic number, because the mean of its divisors is an integer number (41399505).

Almost surely, 2^1081901440 is an apocalyptic number.

1081901440 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 1081901440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1324784160).

1081901440 is an abundant number, since it is smaller than the sum of its proper divisors (1567666880).

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

1081901440 is an equidigital number, since it uses as much as digits as its factorization.

1081901440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41291 (or 41279 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 1081901440 is about 32892.2702165722. The cubic root of 1081901440 is about 1026.5873291890.

The spelling of 1081901440 in words is "one billion, eighty-one million, nine hundred one thousand, four hundred forty".