3891388 has 6 divisors (see below), whose sum is σ = 6809936. Its totient is φ = 1945692.

The previous prime is 3891383. The next prime is 3891389. The reversal of 3891388 is 8831983.

It is a self number, because there is not a number n which added to its sum of digits gives 3891388.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3891383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 486420 + ... + 486427.

Almost surely, 2^3891388 is an apocalyptic number.

It is an amenable number.

3891388 is a deficient number, since it is larger than the sum of its proper divisors (2918548).

3891388 is a wasteful number, since it uses less digits than its factorization.

3891388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972851 (or 972849 counting only the distinct ones).

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

The square root of 3891388 is about 1972.6601329170. The cubic root of 3891388 is about 157.2901446300.

The spelling of 3891388 in words is "three million, eight hundred ninety-one thousand, three hundred eighty-eight".