4018591 has 4 divisors (see below), whose sum is σ = 4033800. Its totient is φ = 4003384.

The previous prime is 4018589. The next prime is 4018627. The reversal of 4018591 is 1958104.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 4018591 - 2¹ = 4018589 is a prime.

It is a super-2 number, since 2×4018591² = 32298147250562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4018541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7201 + ... + 7738.

It is an arithmetic number, because the mean of its divisors is an integer number (1008450).

Almost surely, 2^4018591 is an apocalyptic number.

4018591 is a deficient number, since it is larger than the sum of its proper divisors (15209).

4018591 is a wasteful number, since it uses less digits than its factorization.

4018591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15208.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 4018591 is about 2004.6423621185. The cubic root of 4018591 is about 158.9856532814.

The spelling of 4018591 in words is "four million, eighteen thousand, five hundred ninety-one".