8155420 has 48 divisors (see below), whose sum is σ = 21083328. Its totient is φ = 2580480.

The previous prime is 8155391. The next prime is 8155421. The reversal of 8155420 is 245518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8155421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 421 + ... + 4060.

It is an arithmetic number, because the mean of its divisors is an integer number (439236).

Almost surely, 2^8155420 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 8155420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10541664).

8155420 is an abundant number, since it is smaller than the sum of its proper divisors (12927908).

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

8155420 is a wasteful number, since it uses less digits than its factorization.

8155420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4510 (or 4508 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 8155420 is about 2855.7695985496. The cubic root of 8155420 is about 201.2868687516.

The spelling of 8155420 in words is "eight million, one hundred fifty-five thousand, four hundred twenty".