1906985 has 8 divisors (see below), whose sum is σ = 2295816. Its totient is φ = 1520640.

The previous prime is 1906969. The next prime is 1906987. The reversal of 1906985 is 5896091.

It can be written as a sum of positive squares in 4 ways, for example, as 1038361 + 868624 = 1019^2 + 932^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1906985 - 2⁴ = 1906969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1906987) 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, 2555 + ... + 3215.

It is an arithmetic number, because the mean of its divisors is an integer number (286977).

2^1906985 is an apocalyptic number.

It is an amenable number.

1906985 is a deficient number, since it is larger than the sum of its proper divisors (388831).

1906985 is an equidigital number, since it uses as much as digits as its factorization.

1906985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 1906985 is about 1380.9362765892. The cubic root of 1906985 is about 124.0078255554.

The spelling of 1906985 in words is "one million, nine hundred six thousand, nine hundred eighty-five".