3918439 has 4 divisors (see below), whose sum is σ = 4478224. Its totient is φ = 3358656.

The previous prime is 3918413. The next prime is 3918443. The reversal of 3918439 is 9348193.

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

It is not a de Polignac number, because 3918439 - 2⁷ = 3918311 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3918398 and 3918407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3918139) 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, 279882 + ... + 279895.

It is an arithmetic number, because the mean of its divisors is an integer number (1119556).

Almost surely, 2^3918439 is an apocalyptic number.

3918439 is a deficient number, since it is larger than the sum of its proper divisors (559785).

3918439 is an equidigital number, since it uses as much as digits as its factorization.

3918439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559784.

The product of its digits is 23328, while the sum is 37.

The square root of 3918439 is about 1979.5047360388. The cubic root of 3918439 is about 157.6537710436.

The spelling of 3918439 in words is "three million, nine hundred eighteen thousand, four hundred thirty-nine".