4021245 has 20 divisors (see below), whose sum is σ = 7209180. Its totient is φ = 2144448.

The previous prime is 4021243. The next prime is 4021247. The reversal of 4021245 is 5421204.

It is an interprime number because it is at equal distance from previous prime (4021243) and next prime (4021247).

It can be written as a sum of positive squares in 2 ways, for example, as 1127844 + 2893401 = 1062^2 + 1701^2 .

It is not a de Polignac number, because 4021245 - 2¹ = 4021243 is a prime.

It is a super-2 number, since 2×4021245² = 32340822700050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4560 + ... + 5369.

It is an arithmetic number, because the mean of its divisors is an integer number (360459).

Almost surely, 2^4021245 is an apocalyptic number.

4021245 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4021245 is a deficient number, since it is larger than the sum of its proper divisors (3187935).

4021245 is an equidigital number, since it uses as much as digits as its factorization.

4021245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9946 (or 9937 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 4021245 is about 2005.3042163223. The cubic root of 4021245 is about 159.0206452366.

Adding to 4021245 its reverse (5421204), we get a palindrome (9442449).

The spelling of 4021245 in words is "four million, twenty-one thousand, two hundred forty-five".