1906885 has 4 divisors (see below), whose sum is σ = 2288268. Its totient is φ = 1525504.

The previous prime is 1906871. The next prime is 1906889. The reversal of 1906885 is 5886091.

1906885 = T₁₁₂₆ + T₁₁₂₇ + T₁₁₂₈.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5886091 = 23 ⋅255917.

It can be written as a sum of positive squares in 2 ways, for example, as 224676 + 1682209 = 474^2 + 1297^2 .

It is a cyclic number.

It is not a de Polignac number, because 1906885 - 2⁷ = 1906757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1906889) 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, 190684 + ... + 190693.

It is an arithmetic number, because the mean of its divisors is an integer number (572067).

2^1906885 is an apocalyptic number.

1906885 is the 1128-th centered triangular number.

It is an amenable number.

1906885 is a deficient number, since it is larger than the sum of its proper divisors (381383).

1906885 is an equidigital number, since it uses as much as digits as its factorization.

1906885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381382.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 1906885 is about 1380.9000687957. The cubic root of 1906885 is about 124.0056579104.

The spelling of 1906885 in words is "one million, nine hundred six thousand, eight hundred eighty-five".