3781205 has 12 divisors (see below), whose sum is σ = 4656780. Its totient is φ = 2947392.

The previous prime is 3781189. The next prime is 3781213. The reversal of 3781205 is 5021873.

It can be written as a sum of positive squares in 2 ways, for example, as 2531281 + 1249924 = 1591^2 + 1118^2 .

It is not a de Polignac number, because 3781205 - 2⁴ = 3781189 is a prime.

It is a super-2 number, since 2×3781205² = 28595022504050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9041 + ... + 9449.

It is an arithmetic number, because the mean of its divisors is an integer number (388065).

Almost surely, 2^3781205 is an apocalyptic number.

It is an amenable number.

3781205 is a deficient number, since it is larger than the sum of its proper divisors (875575).

3781205 is an equidigital number, since it uses as much as digits as its factorization.

3781205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 3781205 is about 1944.5320773903. The cubic root of 3781205 is about 155.7913740890.

The spelling of 3781205 in words is "three million, seven hundred eighty-one thousand, two hundred five".