1896391 has 4 divisors (see below), whose sum is σ = 2167312. Its totient is φ = 1625472.

The previous prime is 1896353. The next prime is 1896407. The reversal of 1896391 is 1936981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1896391 - 2⁷ = 1896263 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1896391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1896331) 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, 135450 + ... + 135463.

It is an arithmetic number, because the mean of its divisors is an integer number (541828).

2^1896391 is an apocalyptic number.

1896391 is a deficient number, since it is larger than the sum of its proper divisors (270921).

1896391 is an equidigital number, since it uses as much as digits as its factorization.

1896391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270920.

The product of its digits is 11664, while the sum is 37.

The square root of 1896391 is about 1377.0951310639. The cubic root of 1896391 is about 123.7777627062. Note that the first 4 decimals are identical.

The spelling of 1896391 in words is "one million, eight hundred ninety-six thousand, three hundred ninety-one".