1905345 has 24 divisors (see below), whose sum is σ = 3557736. Its totient is φ = 937728.

The previous prime is 1905331. The next prime is 1905347. The reversal of 1905345 is 5435091.

It can be written as a sum of positive squares in 4 ways, for example, as 194481 + 1710864 = 441^2 + 1308^2 .

It is not a de Polignac number, because 1905345 - 2¹⁶ = 1839809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1905347) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1044 + ... + 2213.

It is an arithmetic number, because the mean of its divisors is an integer number (148239).

2^1905345 is an apocalyptic number.

1905345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1905345 is a deficient number, since it is larger than the sum of its proper divisors (1652391).

1905345 is a wasteful number, since it uses less digits than its factorization.

1905345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3281 (or 3278 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 1905345 is about 1380.3423488396. The cubic root of 1905345 is about 123.9722666038.

The spelling of 1905345 in words is "one million, nine hundred five thousand, three hundred forty-five".