4991439 has 4 divisors (see below), whose sum is σ = 6655256. Its totient is φ = 3327624.

The previous prime is 4991431. The next prime is 4991449. The reversal of 4991439 is 9341994.

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

It is not a de Polignac number, because 4991439 - 2³ = 4991431 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4991397 and 4991406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4991431) 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, 831904 + ... + 831909.

It is an arithmetic number, because the mean of its divisors is an integer number (1663814).

Almost surely, 2^4991439 is an apocalyptic number.

4991439 is a deficient number, since it is larger than the sum of its proper divisors (1663817).

4991439 is a wasteful number, since it uses less digits than its factorization.

4991439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1663816.

The product of its digits is 34992, while the sum is 39.

The square root of 4991439 is about 2234.1528595868. The cubic root of 4991439 is about 170.8999448873.

The spelling of 4991439 in words is "four million, nine hundred ninety-one thousand, four hundred thirty-nine".