1881636 has 24 divisors (see below), whose sum is σ = 4542720. Its totient is φ = 605472.

The previous prime is 1881631. The next prime is 1881641. The reversal of 1881636 is 6361881.

It is an interprime number because it is at equal distance from previous prime (1881631) and next prime (1881641).

It is a junction number, because it is equal to n+sod(n) for n = 1881597 and 1881606.

It is not an unprimeable number, because it can be changed into a prime (1881631) 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, 2356 + ... + 3051.

It is an arithmetic number, because the mean of its divisors is an integer number (189280).

2^1881636 is an apocalyptic number.

It is an amenable number.

1881636 is an abundant number, since it is smaller than the sum of its proper divisors (2661084).

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

1881636 is a wasteful number, since it uses less digits than its factorization.

1881636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5443 (or 5441 counting only the distinct ones).

The product of its digits is 6912, while the sum is 33.

The square root of 1881636 is about 1371.7273781623. The cubic root of 1881636 is about 123.4559060626.

The spelling of 1881636 in words is "one million, eight hundred eighty-one thousand, six hundred thirty-six".