3891284 has 12 divisors (see below), whose sum is σ = 6856500. Its totient is φ = 1932288.

The previous prime is 3891263. The next prime is 3891287. The reversal of 3891284 is 4821983.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 394384 + 3496900 = 628^2 + 1870^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3891287) 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, 2669 + ... + 3860.

It is an arithmetic number, because the mean of its divisors is an integer number (571375).

Almost surely, 2^3891284 is an apocalyptic number.

It is an amenable number.

3891284 is a deficient number, since it is larger than the sum of its proper divisors (2965216).

3891284 is a wasteful number, since it uses less digits than its factorization.

3891284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6682 (or 6680 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 3891284 is about 1972.6337723967. The cubic root of 3891284 is about 157.2887433887.

The spelling of 3891284 in words is "three million, eight hundred ninety-one thousand, two hundred eighty-four".