1881826 has 4 divisors (see below), whose sum is σ = 2822742. Its totient is φ = 940912.

The previous prime is 1881823. The next prime is 1881851. The reversal of 1881826 is 6281881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6281881 = 691 ⋅9091.

It can be written as a sum of positive squares in only one way, i.e., 1692601 + 189225 = 1301^2 + 435^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1881791 and 1881800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 470455 + ... + 470458.

2^1881826 is an apocalyptic number.

1881826 is a deficient number, since it is larger than the sum of its proper divisors (940916).

1881826 is an equidigital number, since it uses as much as digits as its factorization.

1881826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940915.

The product of its digits is 6144, while the sum is 34.

The square root of 1881826 is about 1371.7966321580. The cubic root of 1881826 is about 123.4600612823.

The spelling of 1881826 in words is "one million, eight hundred eighty-one thousand, eight hundred twenty-six".