8420250 has 64 divisors (see below), whose sum is σ = 21415680. Its totient is φ = 2203200.

The previous prime is 8420239. The next prime is 8420261. The reversal of 8420250 is 520248.

It is an interprime number because it is at equal distance from previous prime (8420239) and next prime (8420261).

It is a super-2 number, since 2×8420250² = 141801220125000, 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 31 ways as a sum of consecutive naturals, for example, 77196 + ... + 77304.

It is an arithmetic number, because the mean of its divisors is an integer number (334620).

Almost surely, 2^8420250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8420250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10707840).

8420250 is an abundant number, since it is smaller than the sum of its proper divisors (12995430).

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

8420250 is a wasteful number, since it uses less digits than its factorization.

8420250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 8420250 is about 2901.7667032344. The cubic root of 8420250 is about 203.4424896901.

Adding to 8420250 its reverse (520248), we get a palindrome (8940498).

The spelling of 8420250 in words is "eight million, four hundred twenty thousand, two hundred fifty".