4389891 has 16 divisors (see below), whose sum is σ = 6438528. Its totient is φ = 2638400.

The previous prime is 4389883. The next prime is 4389899. The reversal of 4389891 is 1989834.

It is an interprime number because it is at equal distance from previous prime (4389883) and next prime (4389899).

It is a cyclic number.

It is not a de Polignac number, because 4389891 - 2³ = 4389883 is a prime.

It is a super-2 number, since 2×4389891² = 38542285983762, which contains 22 as substring.

4389891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4389899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4036 + ... + 5006.

It is an arithmetic number, because the mean of its divisors is an integer number (402408).

Almost surely, 2^4389891 is an apocalyptic number.

4389891 is a deficient number, since it is larger than the sum of its proper divisors (2048637).

4389891 is a wasteful number, since it uses less digits than its factorization.

4389891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122.

The product of its digits is 62208, while the sum is 42.

The square root of 4389891 is about 2095.2066723834. The cubic root of 4389891 is about 163.7386651828.

The spelling of 4389891 in words is "four million, three hundred eighty-nine thousand, eight hundred ninety-one".