1921895 has 8 divisors (see below), whose sum is σ = 2341104. Its totient is φ = 1514304.

The previous prime is 1921889. The next prime is 1921919. The reversal of 1921895 is 5981291.

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

It is a cyclic number.

It is not a de Polignac number, because 1921895 - 2⁴ = 1921879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2534 + ... + 3203.

It is an arithmetic number, because the mean of its divisors is an integer number (292638).

2^1921895 is an apocalyptic number.

1921895 is a deficient number, since it is larger than the sum of its proper divisors (419209).

1921895 is an equidigital number, since it uses as much as digits as its factorization.

1921895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5809.

The product of its digits is 6480, while the sum is 35.

The square root of 1921895 is about 1386.3242766395. The cubic root of 1921895 is about 124.3301771096.

The spelling of 1921895 in words is "one million, nine hundred twenty-one thousand, eight hundred ninety-five".