1908561 has 8 divisors (see below), whose sum is σ = 2577280. Its totient is φ = 1256112.

The previous prime is 1908527. The next prime is 1908581. The reversal of 1908561 is 1658091.

It is a happy number.

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

It is not a de Polignac number, because 1908561 - 2⁷ = 1908433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1908521) 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, 3790 + ... + 4263.

It is an arithmetic number, because the mean of its divisors is an integer number (322160).

2^1908561 is an apocalyptic number.

It is an amenable number.

1908561 is a deficient number, since it is larger than the sum of its proper divisors (668719).

1908561 is an equidigital number, since it uses as much as digits as its factorization.

1908561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8135.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 1908561 is about 1381.5067860854. The cubic root of 1908561 is about 124.0419776365.

The spelling of 1908561 in words is "one million, nine hundred eight thousand, five hundred sixty-one".