3891447 has 24 divisors (see below), whose sum is σ = 6764160. Its totient is φ = 2106000.

The previous prime is 3891431. The next prime is 3891449. The reversal of 3891447 is 7441983.

It is a happy number.

It is not a de Polignac number, because 3891447 - 2⁴ = 3891431 is a prime.

3891447 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3891449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 429 + ... + 2822.

It is an arithmetic number, because the mean of its divisors is an integer number (281840).

Almost surely, 2^3891447 is an apocalyptic number.

3891447 is a deficient number, since it is larger than the sum of its proper divisors (2872713).

3891447 is a wasteful number, since it uses less digits than its factorization.

3891447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3283 (or 3280 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 3891447 is about 1972.6750872863. The cubic root of 3891447 is about 157.2909395539.

The spelling of 3891447 in words is "three million, eight hundred ninety-one thousand, four hundred forty-seven".