1897205 has 4 divisors (see below), whose sum is σ = 2276652. Its totient is φ = 1517760.

The previous prime is 1897199. The next prime is 1897219. The reversal of 1897205 is 5027981.

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

It can be written as a sum of positive squares in 2 ways, for example, as 276676 + 1620529 = 526^2 + 1273^2 .

It is not a de Polignac number, because 1897205 - 2⁶ = 1897141 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189716 + ... + 189725.

It is an arithmetic number, because the mean of its divisors is an integer number (569163).

2^1897205 is an apocalyptic number.

It is an amenable number.

1897205 is a deficient number, since it is larger than the sum of its proper divisors (379447).

1897205 is an equidigital number, since it uses as much as digits as its factorization.

1897205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379446.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 1897205 is about 1377.3906490172. The cubic root of 1897205 is about 123.7954701457.

The spelling of 1897205 in words is "one million, eight hundred ninety-seven thousand, two hundred five".