3888391 has 4 divisors (see below), whose sum is σ = 4187512. Its totient is φ = 3589272.

The previous prime is 3888389. The next prime is 3888397. The reversal of 3888391 is 1938883.

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 3888391 - 2¹ = 3888389 is a prime.

It is a Duffinian number.

3888391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3888397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149541 + ... + 149566.

It is an arithmetic number, because the mean of its divisors is an integer number (1046878).

Almost surely, 2^3888391 is an apocalyptic number.

3888391 is a deficient number, since it is larger than the sum of its proper divisors (299121).

3888391 is a wasteful number, since it uses less digits than its factorization.

3888391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299120.

The product of its digits is 41472, while the sum is 40.

The square root of 3888391 is about 1971.9003524519. The cubic root of 3888391 is about 157.2497546172.

It can be divided in two parts, 38883 and 91, that multiplied together give a palindrome (3538353).

The spelling of 3888391 in words is "three million, eight hundred eighty-eight thousand, three hundred ninety-one".