3855147 has 4 divisors (see below), whose sum is σ = 5140200. Its totient is φ = 2570096.

The previous prime is 3855143. The next prime is 3855149. The reversal of 3855147 is 7415583.

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

It is a cyclic number.

It is not a de Polignac number, because 3855147 - 2² = 3855143 is a prime.

It is a D-number.

3855147 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3855143) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 642522 + ... + 642527.

It is an arithmetic number, because the mean of its divisors is an integer number (1285050).

Almost surely, 2^3855147 is an apocalyptic number.

3855147 is a deficient number, since it is larger than the sum of its proper divisors (1285053).

3855147 is a wasteful number, since it uses less digits than its factorization.

3855147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285052.

The product of its digits is 16800, while the sum is 33.

The square root of 3855147 is about 1963.4528260185. The cubic root of 3855147 is about 156.8003330853.

The spelling of 3855147 in words is "three million, eight hundred fifty-five thousand, one hundred forty-seven".