4020345 has 24 divisors (see below), whose sum is σ = 7964736. Its totient is φ = 1837728.

The previous prime is 4020323. The next prime is 4020349. The reversal of 4020345 is 5430204.

It is a happy number.

It is not a de Polignac number, because 4020345 - 2⁶ = 4020281 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4020349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6067 + ... + 6696.

It is an arithmetic number, because the mean of its divisors is an integer number (331864).

Almost surely, 2^4020345 is an apocalyptic number.

4020345 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4020345 is a deficient number, since it is larger than the sum of its proper divisors (3944391).

4020345 is a wasteful number, since it uses less digits than its factorization.

4020345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12781 (or 12778 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 4020345 is about 2005.0797989108. The cubic root of 4020345 is about 159.0087808133.

Adding to 4020345 its reverse (5430204), we get a palindrome (9450549).

The spelling of 4020345 in words is "four million, twenty thousand, three hundred forty-five".