7842818 has 8 divisors (see below), whose sum is σ = 12169980. Its totient is φ = 3786160.

The previous prime is 7842803. The next prime is 7842823. The reversal of 7842818 is 8182487.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7491169 + 351649 = 2737^2 + 593^2 .

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

It is a super-2 number, since 2×7842818² = 123019588362248, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67553 + ... + 67668.

Almost surely, 2^7842818 is an apocalyptic number.

7842818 is a deficient number, since it is larger than the sum of its proper divisors (4327162).

7842818 is a wasteful number, since it uses less digits than its factorization.

7842818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135252.

The product of its digits is 28672, while the sum is 38.

The square root of 7842818 is about 2800.5031690752. The cubic root of 7842818 is about 198.6814765821.

Subtracting from 7842818 its sum of digits (38), we obtain a triangular number (7842780 = T₃₉₆₀).

The spelling of 7842818 in words is "seven million, eight hundred forty-two thousand, eight hundred eighteen".