3945381 has 8 divisors (see below), whose sum is σ = 5738784. Its totient is φ = 2391120.

The previous prime is 3945367. The next prime is 3945391. The reversal of 3945381 is 1835493.

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

It is not a de Polignac number, because 3945381 - 2⁵ = 3945349 is a prime.

It is a super-2 number, since 2×3945381² = 31132062470322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 119557 = 3945381 / (3 + 9 + 4 + 5 + 3 + 8 + 1).

It is a Curzon number.

3945381 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3945301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59746 + ... + 59811.

It is an arithmetic number, because the mean of its divisors is an integer number (717348).

Almost surely, 2^3945381 is an apocalyptic number.

It is an amenable number.

3945381 is a deficient number, since it is larger than the sum of its proper divisors (1793403).

3945381 is a wasteful number, since it uses less digits than its factorization.

3945381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119571.

The product of its digits is 12960, while the sum is 33.

The square root of 3945381 is about 1986.2983159636. The cubic root of 3945381 is about 158.0142725984.

It can be divided in two parts, 394 and 5381, that added together give a palindrome (5775).

The spelling of 3945381 in words is "three million, nine hundred forty-five thousand, three hundred eighty-one".