1881626 has 4 divisors (see below), whose sum is σ = 2822442. Its totient is φ = 940812.

The previous prime is 1881619. The next prime is 1881631. The reversal of 1881626 is 6261881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6261881 = 397 ⋅15773.

It can be written as a sum of positive squares in only one way, i.e., 1243225 + 638401 = 1115^2 + 799^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1881592 and 1881601.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 470405 + ... + 470408.

2^1881626 is an apocalyptic number.

1881626 is a deficient number, since it is larger than the sum of its proper divisors (940816).

1881626 is an equidigital number, since it uses as much as digits as its factorization.

1881626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940815.

The product of its digits is 4608, while the sum is 32.

The square root of 1881626 is about 1371.7237331183. The cubic root of 1881626 is about 123.4556873591.

The spelling of 1881626 in words is "one million, eight hundred eighty-one thousand, six hundred twenty-six".