3781945 has 8 divisors (see below), whose sum is σ = 4583880. Its totient is φ = 2995200.

The previous prime is 3781909. The next prime is 3781951. The reversal of 3781945 is 5491873.

It can be written as a sum of positive squares in 4 ways, for example, as 1263376 + 2518569 = 1124^2 + 1587^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3781945 - 2⁹ = 3781433 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3240 + ... + 4249.

It is an arithmetic number, because the mean of its divisors is an integer number (572985).

Almost surely, 2^3781945 is an apocalyptic number.

It is an amenable number.

3781945 is a deficient number, since it is larger than the sum of its proper divisors (801935).

3781945 is a wasteful number, since it uses less digits than its factorization.

3781945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7595.

The product of its digits is 30240, while the sum is 37.

The square root of 3781945 is about 1944.7223452205. The cubic root of 3781945 is about 155.8015364664.

The spelling of 3781945 in words is "three million, seven hundred eighty-one thousand, nine hundred forty-five".