1085731812 has 72 divisors (see below), whose sum is σ = 3097261440. Its totient is φ = 317661120.

The previous prime is 1085731771. The next prime is 1085731849. The reversal of 1085731812 is 2181375801.

1085731812 is a `hidden beast` number, since 1 + 0 + 8 + 573 + 1 + 81 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 35788 + ... + 58755.

It is an arithmetic number, because the mean of its divisors is an integer number (43017520).

Almost surely, 2^1085731812 is an apocalyptic number.

1085731812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1085731812 is an abundant number, since it is smaller than the sum of its proper divisors (2011529628).

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

1085731812 is a wasteful number, since it uses less digits than its factorization.

1085731812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94593 (or 94588 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The square root of 1085731812 is about 32950.4447921420. Note that the first 3 decimals coincide. The cubic root of 1085731812 is about 1027.7974147472.

The spelling of 1085731812 in words is "one billion, eighty-five million, seven hundred thirty-one thousand, eight hundred twelve".