1081117440 has 216 divisors, whose sum is σ = 4028846640. Its totient is φ = 266084352.

The previous prime is 1081117421. The next prime is 1081117441. The reversal of 1081117440 is 447111801.

1081117440 is a `hidden beast` number, since 108 + 1 + 117 + 440 = 666.

It is not an unprimeable number, because it can be changed into a prime (1081117441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 146151 + ... + 153369.

Almost surely, 2^1081117440 is an apocalyptic number.

1081117440 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 1081117440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2014423320).

1081117440 is an abundant number, since it is smaller than the sum of its proper divisors (2947729200).

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

1081117440 is a wasteful number, since it uses less digits than its factorization.

1081117440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7259 (or 7242 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 1081117440 is about 32880.3503630968. The cubic root of 1081117440 is about 1026.3392970594.

The spelling of 1081117440 in words is "one billion, eighty-one million, one hundred seventeen thousand, four hundred forty".