4078391 has 4 divisors (see below), whose sum is σ = 4209984. Its totient is φ = 3946800.

The previous prime is 4078387. The next prime is 4078397. The reversal of 4078391 is 1938704.

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 4078391 - 2² = 4078387 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 (4078397) 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, 65750 + ... + 65811.

It is an arithmetic number, because the mean of its divisors is an integer number (1052496).

Almost surely, 2^4078391 is an apocalyptic number.

4078391 is a deficient number, since it is larger than the sum of its proper divisors (131593).

4078391 is a wasteful number, since it uses less digits than its factorization.

4078391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131592.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 4078391 is about 2019.5026615481. The cubic root of 4078391 is about 159.7703867895.

The spelling of 4078391 in words is "four million, seventy-eight thousand, three hundred ninety-one".