6840242 has 4 divisors (see below), whose sum is σ = 10260366. Its totient is φ = 3420120.

The previous prime is 6840241. The next prime is 6840257. The reversal of 6840242 is 2420486.

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

It can be written as a sum of positive squares in only one way, i.e., 6405961 + 434281 = 2531^2 + 659^2 .

It is not an unprimeable number, because it can be changed into a prime (6840241) 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 as a sum of consecutive naturals, namely, 1710059 + ... + 1710062.

Almost surely, 2^6840242 is an apocalyptic number.

6840242 is a deficient number, since it is larger than the sum of its proper divisors (3420124).

6840242 is a wasteful number, since it uses less digits than its factorization.

6840242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3420123.

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 6840242 is about 2615.3856312215. The cubic root of 6840242 is about 189.8266378040.

The spelling of 6840242 in words is "six million, eight hundred forty thousand, two hundred forty-two".