1089855018 has 48 divisors (see below), whose sum is σ = 2729039040. Its totient is φ = 307885248.

The previous prime is 1089854999. The next prime is 1089855037. The reversal of 1089855018 is 8105589801.

1089855018 is a `hidden beast` number, since 1 + 0 + 8 + 98 + 550 + 1 + 8 = 666.

1089855018 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1089854999) and next prime (1089855037).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37380 + ... + 59807.

It is an arithmetic number, because the mean of its divisors is an integer number (56854980).

Almost surely, 2^1089855018 is an apocalyptic number.

1089855018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1089855018 is an abundant number, since it is smaller than the sum of its proper divisors (1639184022).

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

1089855018 is a wasteful number, since it uses less digits than its factorization.

1089855018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97291 (or 97288 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 45.

The square root of 1089855018 is about 33012.9522763415. The cubic root of 1089855018 is about 1029.0968354556.

It can be divided in two parts, 108985 and 5018, that added together give a triangular number (114003 = T₄₇₇).

The spelling of 1089855018 in words is "one billion, eighty-nine million, eight hundred fifty-five thousand, eighteen".