4378439 has 4 divisors (see below), whose sum is σ = 4715256. Its totient is φ = 4041624.

The previous prime is 4378403. The next prime is 4378447. The reversal of 4378439 is 9348734.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9348734 = 2 ⋅4674367.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4378439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4378139) 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, 168389 + ... + 168414.

It is an arithmetic number, because the mean of its divisors is an integer number (1178814).

Almost surely, 2^4378439 is an apocalyptic number.

4378439 is a deficient number, since it is larger than the sum of its proper divisors (336817).

4378439 is a wasteful number, since it uses less digits than its factorization.

4378439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336816.

The product of its digits is 72576, while the sum is 38.

The square root of 4378439 is about 2092.4719830860. The cubic root of 4378439 is about 163.5961583697.

The spelling of 4378439 in words is "four million, three hundred seventy-eight thousand, four hundred thirty-nine".