4191989 has 16 divisors (see below), whose sum is σ = 4651200. Its totient is φ = 3763584.

The previous prime is 4191983. The next prime is 4191991. The reversal of 4191989 is 9891914.

It is a cyclic number.

It is not a de Polignac number, because 4191989 - 2⁴ = 4191973 is a prime.

It is a super-2 number, since 2×4191989² = 35145543552242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4191983) 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, 47057 + ... + 47145.

It is an arithmetic number, because the mean of its divisors is an integer number (290700).

Almost surely, 2^4191989 is an apocalyptic number.

It is an amenable number.

4191989 is a deficient number, since it is larger than the sum of its proper divisors (459211).

4191989 is a wasteful number, since it uses less digits than its factorization.

4191989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212.

The product of its digits is 23328, while the sum is 41.

The square root of 4191989 is about 2047.4347364446. The cubic root of 4191989 is about 161.2402185441.

The spelling of 4191989 in words is "four million, one hundred ninety-one thousand, nine hundred eighty-nine".