1861812 has 24 divisors (see below), whose sum is σ = 4827200. Its totient is φ = 620568.

The previous prime is 1861807. The next prime is 1861817. The reversal of 1861812 is 2181681.

It is an interprime number because it is at equal distance from previous prime (1861807) and next prime (1861817).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861817) 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, 8512 + ... + 8727.

2^1861812 is an apocalyptic number.

1861812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1861812 is an abundant number, since it is smaller than the sum of its proper divisors (2965388).

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

1861812 is a wasteful number, since it uses less digits than its factorization.

1861812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17252 (or 17244 counting only the distinct ones).

The product of its digits is 768, while the sum is 27.

The square root of 1861812 is about 1364.4823194164. The cubic root of 1861812 is about 123.0208174164.

The spelling of 1861812 in words is "one million, eight hundred sixty-one thousand, eight hundred twelve".