1881205 has 4 divisors (see below), whose sum is σ = 2257452. Its totient is φ = 1504960.

The previous prime is 1881199. The next prime is 1881211. The reversal of 1881205 is 5021881.

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

It is an interprime number because it is at equal distance from previous prime (1881199) and next prime (1881211).

It can be written as a sum of positive squares in 2 ways, for example, as 1096209 + 784996 = 1047^2 + 886^2 .

It is not a de Polignac number, because 1881205 - 2³ = 1881197 is a prime.

It is a Duffinian number.

1881205 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1881205.

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, 188116 + ... + 188125.

It is an arithmetic number, because the mean of its divisors is an integer number (564363).

2^1881205 is an apocalyptic number.

It is an amenable number.

1881205 is a deficient number, since it is larger than the sum of its proper divisors (376247).

1881205 is an equidigital number, since it uses as much as digits as its factorization.

1881205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376246.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 1881205 is about 1371.5702679775. The cubic root of 1881205 is about 123.4464792378.

The spelling of 1881205 in words is "one million, eight hundred eighty-one thousand, two hundred five".