1908891 has 6 divisors (see below), whose sum is σ = 2757300. Its totient is φ = 1272588.

The previous prime is 1908883. The next prime is 1908923. The reversal of 1908891 is 1988091.

It is not a de Polignac number, because 1908891 - 2³ = 1908883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1908871) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106041 + ... + 106058.

It is an arithmetic number, because the mean of its divisors is an integer number (459550).

2^1908891 is an apocalyptic number.

1908891 is a deficient number, since it is larger than the sum of its proper divisors (848409).

1908891 is a wasteful number, since it uses less digits than its factorization.

1908891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212105 (or 212102 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 1908891 is about 1381.6262157328. The cubic root of 1908891 is about 124.0491263895.

The spelling of 1908891 in words is "one million, nine hundred eight thousand, eight hundred ninety-one".