4067991 has 24 divisors (see below), whose sum is σ = 6140160. Its totient is φ = 2593296.

The previous prime is 4067983. The next prime is 4068011. The reversal of 4067991 is 1997604.

It is not a de Polignac number, because 4067991 - 2³ = 4067983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4067951) 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, 24876 + ... + 25038.

It is an arithmetic number, because the mean of its divisors is an integer number (255840).

Almost surely, 2^4067991 is an apocalyptic number.

4067991 is a deficient number, since it is larger than the sum of its proper divisors (2072169).

4067991 is a wasteful number, since it uses less digits than its factorization.

4067991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275 (or 272 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 4067991 is about 2016.9261265599. The cubic root of 4067991 is about 159.6344650162.

The spelling of 4067991 in words is "four million, sixty-seven thousand, nine hundred ninety-one".