3921385 has 32 divisors (see below), whose sum is σ = 5499648. Its totient is φ = 2661120.

The previous prime is 3921383. The next prime is 3921413. The reversal of 3921385 is 5831293.

It is a happy number.

It is not a de Polignac number, because 3921385 - 2¹ = 3921383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3921383) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64255 + ... + 64315.

It is an arithmetic number, because the mean of its divisors is an integer number (171864).

Almost surely, 2^3921385 is an apocalyptic number.

It is an amenable number.

3921385 is a deficient number, since it is larger than the sum of its proper divisors (1578263).

3921385 is a wasteful number, since it uses less digits than its factorization.

3921385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145.

The product of its digits is 6480, while the sum is 31.

The square root of 3921385 is about 1980.2487217519. The cubic root of 3921385 is about 157.6932707579.

The spelling of 3921385 in words is "three million, nine hundred twenty-one thousand, three hundred eighty-five".