4050391 has 4 divisors (see below), whose sum is σ = 4059712. Its totient is φ = 4041072.

The previous prime is 4050377. The next prime is 4050433. The reversal of 4050391 is 1930504.

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 4050391 - 2⁵ = 4050359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4050311) 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, 3975 + ... + 4888.

It is an arithmetic number, because the mean of its divisors is an integer number (1014928).

Almost surely, 2^4050391 is an apocalyptic number.

4050391 is a deficient number, since it is larger than the sum of its proper divisors (9321).

4050391 is an equidigital number, since it uses as much as digits as its factorization.

4050391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9320.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 4050391 is about 2012.5583221363. The cubic root of 4050391 is about 159.4039148358.

Adding to 4050391 its reverse (1930504), we get a palindrome (5980895).

The spelling of 4050391 in words is "four million, fifty thousand, three hundred ninety-one".