1009812 has 48 divisors (see below), whose sum is σ = 2562560. Its totient is φ = 308448.

The previous prime is 1009807. The next prime is 1009819. The reversal of 1009812 is 2189001.

1009812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1009819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9753 + ... + 9855.

2^1009812 is an apocalyptic number.

1009812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1009812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1281280).

1009812 is an abundant number, since it is smaller than the sum of its proper divisors (1552748).

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

1009812 is a wasteful number, since it uses less digits than its factorization.

1009812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1009812 is about 1004.8940242633. The cubic root of 1009812 is about 100.3260027339.

The spelling of 1009812 in words is "one million, nine thousand, eight hundred twelve".