1087155918 has 40 divisors (see below), whose sum is σ = 2495465280. Its totient is φ = 353544480.

The previous prime is 1087155917. The next prime is 1087155961. The reversal of 1087155918 is 8195517801.

1087155918 is a `hidden beast` number, since 1 + 0 + 87 + 1 + 559 + 18 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1087155913) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 75198 + ... + 88481.

It is an arithmetic number, because the mean of its divisors is an integer number (62386632).

Almost surely, 2^1087155918 is an apocalyptic number.

1087155918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1087155918 is an abundant number, since it is smaller than the sum of its proper divisors (1408309362).

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

1087155918 is a wasteful number, since it uses less digits than its factorization.

1087155918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163734 (or 163725 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 45.

The square root of 1087155918 is about 32972.0475251386. The cubic root of 1087155918 is about 1028.2465904280.

The spelling of 1087155918 in words is "one billion, eighty-seven million, one hundred fifty-five thousand, nine hundred eighteen".