4991239 has 8 divisors (see below), whose sum is σ = 5466240. Its totient is φ = 4519800.

The previous prime is 4991237. The next prime is 4991249. The reversal of 4991239 is 9321994.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4991239 - 2¹ = 4991237 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4991198 and 4991207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4991237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2692 + ... + 4150.

It is an arithmetic number, because the mean of its divisors is an integer number (683280).

Almost surely, 2^4991239 is an apocalyptic number.

4991239 is a deficient number, since it is larger than the sum of its proper divisors (475001).

4991239 is a wasteful number, since it uses less digits than its factorization.

4991239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1781.

The product of its digits is 17496, while the sum is 37.

The square root of 4991239 is about 2234.1080994437. The cubic root of 4991239 is about 170.8976622826.

The spelling of 4991239 in words is "four million, nine hundred ninety-one thousand, two hundred thirty-nine".