7842420 has 120 divisors (see below), whose sum is σ = 25369344. Its totient is φ = 2026944.

The previous prime is 7842403. The next prime is 7842427. The reversal of 7842420 is 242487.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7842427) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 76089 + ... + 76191.

Almost surely, 2^7842420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7842420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12684672).

7842420 is an abundant number, since it is smaller than the sum of its proper divisors (17526924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7842420 is a wasteful number, since it uses less digits than its factorization.

7842420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 7842420 is about 2800.4321095145. The cubic root of 7842420 is about 198.6781156913.

The spelling of 7842420 in words is "seven million, eight hundred forty-two thousand, four hundred twenty".