1945205 has 4 divisors (see below), whose sum is σ = 2334252. Its totient is φ = 1556160.

The previous prime is 1945199. The next prime is 1945243. The reversal of 1945205 is 5025491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5025491 = 389 ⋅12919.

It can be written as a sum of positive squares in 2 ways, for example, as 1267876 + 677329 = 1126^2 + 823^2 .

It is not a de Polignac number, because 1945205 - 2¹⁰ = 1944181 is a prime.

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, 194516 + ... + 194525.

It is an arithmetic number, because the mean of its divisors is an integer number (583563).

2^1945205 is an apocalyptic number.

It is an amenable number.

1945205 is a deficient number, since it is larger than the sum of its proper divisors (389047).

1945205 is an equidigital number, since it uses as much as digits as its factorization.

1945205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389046.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 1945205 is about 1394.7060622224. The cubic root of 1945205 is about 124.8308111043.

The spelling of 1945205 in words is "one million, nine hundred forty-five thousand, two hundred five".