4378391 has 4 divisors (see below), whose sum is σ = 4529400. Its totient is φ = 4227384.

The previous prime is 4378373. The next prime is 4378399. The reversal of 4378391 is 1938734.

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 4378391 - 2⁶ = 4378327 is a prime.

It is a d-powerful number, because it can be written as 4¹¹ + 3³ + 7³ + 8 + 3¹¹ + 9⁴ + 1 .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4378399) 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, 75461 + ... + 75518.

It is an arithmetic number, because the mean of its divisors is an integer number (1132350).

Almost surely, 2^4378391 is an apocalyptic number.

4378391 is a deficient number, since it is larger than the sum of its proper divisors (151009).

4378391 is a wasteful number, since it uses less digits than its factorization.

4378391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151008.

The product of its digits is 18144, while the sum is 35.

The square root of 4378391 is about 2092.4605133670. The cubic root of 4378391 is about 163.5955605429.

The spelling of 4378391 in words is "four million, three hundred seventy-eight thousand, three hundred ninety-one".