3893991 has 8 divisors (see below), whose sum is σ = 5332464. Its totient is φ = 2525760.

The previous prime is 3893983. The next prime is 3894001. The reversal of 3893991 is 1993983.

It is a happy number.

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

It is not a de Polignac number, because 3893991 - 2³ = 3893983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3893971) 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, 17430 + ... + 17651.

It is an arithmetic number, because the mean of its divisors is an integer number (666558).

Almost surely, 2^3893991 is an apocalyptic number.

3893991 is a deficient number, since it is larger than the sum of its proper divisors (1438473).

3893991 is a wasteful number, since it uses less digits than its factorization.

3893991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35121.

The product of its digits is 52488, while the sum is 42.

The square root of 3893991 is about 1973.3197916202. The cubic root of 3893991 is about 157.3252079536.

It can be divided in two parts, 3893 and 991, that added together give a palindrome (4884).

The spelling of 3893991 in words is "three million, eight hundred ninety-three thousand, nine hundred ninety-one".