3905645785 has 8 divisors (see below), whose sum is σ = 4687151040. Its totient is φ = 3124265904.

The previous prime is 3905645749. The next prime is 3905645791. The reversal of 3905645785 is 5875465093.

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

It is a cyclic number.

It is not a de Polignac number, because 3905645785 - 2¹⁵ = 3905613017 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63034 + ... + 108556.

It is an arithmetic number, because the mean of its divisors is an integer number (585893880).

Almost surely, 2^3905645785 is an apocalyptic number.

It is an amenable number.

3905645785 is a deficient number, since it is larger than the sum of its proper divisors (781505255).

3905645785 is a wasteful number, since it uses less digits than its factorization.

3905645785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62687.

The product of its (nonzero) digits is 4536000, while the sum is 52.

The square root of 3905645785 is about 62495.1660930668. The cubic root of 3905645785 is about 1574.8201067738.

The spelling of 3905645785 in words is "three billion, nine hundred five million, six hundred forty-five thousand, seven hundred eighty-five".