1881312 has 24 divisors (see below), whose sum is σ = 4938696. Its totient is φ = 627072.

The previous prime is 1881311. The next prime is 1881329. The reversal of 1881312 is 2131881.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9703 + ... + 9894.

It is an arithmetic number, because the mean of its divisors is an integer number (205779).

2^1881312 is an apocalyptic number.

1881312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1881312 is an abundant number, since it is smaller than the sum of its proper divisors (3057384).

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

1881312 is a wasteful number, since it uses less digits than its factorization.

1881312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19610 (or 19602 counting only the distinct ones).

The product of its digits is 384, while the sum is 24.

The square root of 1881312 is about 1371.6092738094. The cubic root of 1881312 is about 123.4488196744.

The spelling of 1881312 in words is "one million, eight hundred eighty-one thousand, three hundred twelve".