7842449 has 4 divisors (see below), whose sum is σ = 7856100. Its totient is φ = 7828800.

The previous prime is 7842437. The next prime is 7842451. The reversal of 7842449 is 9442487.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5607424 + 2235025 = 2368^2 + 1495^2 .

It is a cyclic number.

It is not a de Polignac number, because 7842449 - 2⁴ = 7842433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7842949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5924 + ... + 7125.

It is an arithmetic number, because the mean of its divisors is an integer number (1964025).

Almost surely, 2^7842449 is an apocalyptic number.

It is an amenable number.

7842449 is a deficient number, since it is larger than the sum of its proper divisors (13651).

7842449 is a wasteful number, since it uses less digits than its factorization.

7842449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13650.

The product of its digits is 64512, while the sum is 38.

The square root of 7842449 is about 2800.4372872821. The cubic root of 7842449 is about 198.6783605842.

Adding to 7842449 its sum of digits (38), we get a palindrome (7842487).

The spelling of 7842449 in words is "seven million, eight hundred forty-two thousand, four hundred forty-nine".