1118997540 has 72 divisors (see below), whose sum is σ = 3451855680. Its totient is φ = 293338944.

The previous prime is 1118997469. The next prime is 1118997569. The reversal of 1118997540 is 457998111.

It is a happy number.

1118997540 is a `hidden beast` number, since 1 + 1 + 18 + 9 + 97 + 540 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42064 + ... + 63303.

It is an arithmetic number, because the mean of its divisors is an integer number (47942440).

Almost surely, 2^1118997540 is an apocalyptic number.

1118997540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1118997540 is an abundant number, since it is smaller than the sum of its proper divisors (2332858140).

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

1118997540 is a wasteful number, since it uses less digits than its factorization.

1118997540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105441 (or 105436 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 45.

The square root of 1118997540 is about 33451.4205976368. The cubic root of 1118997540 is about 1038.1888905245.

The spelling of 1118997540 in words is "one billion, one hundred eighteen million, nine hundred ninety-seven thousand, five hundred forty".