1812089000 has 32 divisors (see below), whose sum is σ = 4240290600. Its totient is φ = 724835200.

The previous prime is 1812088987. The next prime is 1812089009. The reversal of 1812089000 is 9802181.

It can be written as a sum of positive squares in 4 ways, for example, as 319193956 + 1492895044 = 17866^2 + 38638^2 .

It is not an unprimeable number, because it can be changed into a prime (1812089009) 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, 905045 + ... + 907044.

Almost surely, 2^1812089000 is an apocalyptic number.

1812089000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1812089000 is an abundant number, since it is smaller than the sum of its proper divisors (2428201600).

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

1812089000 is a wasteful number, since it uses less digits than its factorization.

1812089000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1812110 (or 1812096 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 1812089000 is about 42568.6386909424. The cubic root of 1812089000 is about 1219.1575748384.

The spelling of 1812089000 in words is "one billion, eight hundred twelve million, eighty-nine thousand".