4000191 has 16 divisors (see below), whose sum is σ = 5802720. Its totient is φ = 2436480.

The previous prime is 4000189. The next prime is 4000237. The reversal of 4000191 is 1910004.

It is not a de Polignac number, because 4000191 - 2¹ = 4000189 is a prime.

It is a super-3 number, since 3×4000191³ (a number of 21 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 4000191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000291) 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, 3781 + ... + 4721.

It is an arithmetic number, because the mean of its divisors is an integer number (362670).

Almost surely, 2^4000191 is an apocalyptic number.

4000191 is a deficient number, since it is larger than the sum of its proper divisors (1802529).

4000191 is a wasteful number, since it uses less digits than its factorization.

4000191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 4000191 is about 2000.0477494300. The cubic root of 4000191 is about 158.7426317699.

Adding to 4000191 its sum of digits (15), we get a triangular number (4000206 = T₂₈₂₈).

Adding to 4000191 its reverse (1910004), we get a palindrome (5910195).

The spelling of 4000191 in words is "four million, one hundred ninety-one", and thus it is an aban number.