4021420 has 24 divisors (see below), whose sum is σ = 9095184. Its totient is φ = 1484736.

The previous prime is 4021417. The next prime is 4021427. The reversal of 4021420 is 241204.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 4021420.

It is not an unprimeable number, because it can be changed into a prime (4021427) 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 7 ways as a sum of consecutive naturals, for example, 7474 + ... + 7993.

It is an arithmetic number, because the mean of its divisors is an integer number (378966).

Almost surely, 2^4021420 is an apocalyptic number.

It is an amenable number.

4021420 is an abundant number, since it is smaller than the sum of its proper divisors (5073764).

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

4021420 is a wasteful number, since it uses less digits than its factorization.

4021420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15489 (or 15487 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 4021420 is about 2005.3478501248. The cubic root of 4021420 is about 159.0229520023.

Adding to 4021420 its reverse (241204), we get a palindrome (4262624).

The spelling of 4021420 in words is "four million, twenty-one thousand, four hundred twenty".