1081918398 has 16 divisors (see below), whose sum is σ = 2360549376. Its totient is φ = 327854040.

The previous prime is 1081918393. The next prime is 1081918417. The reversal of 1081918398 is 8938191801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081918391) 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, 8196286 + ... + 8196417.

It is an arithmetic number, because the mean of its divisors is an integer number (147534336).

Almost surely, 2^1081918398 is an apocalyptic number.

1081918398 is an abundant number, since it is smaller than the sum of its proper divisors (1278630978).

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

1081918398 is a wasteful number, since it uses less digits than its factorization.

1081918398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16392719.

The product of its (nonzero) digits is 124416, while the sum is 48.

The square root of 1081918398 is about 32892.5279964918. The cubic root of 1081918398 is about 1026.5926928252.

The spelling of 1081918398 in words is "one billion, eighty-one million, nine hundred eighteen thousand, three hundred ninety-eight".