4028621 has 2 divisors, whose sum is σ = 4028622. Its totient is φ = 4028620.

The previous prime is 4028603. The next prime is 4028641. The reversal of 4028621 is 1268204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3200521 + 828100 = 1789^2 + 910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4028621 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4028641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2014310 + 2014311.

It is an arithmetic number, because the mean of its divisors is an integer number (2014311).

Almost surely, 2^4028621 is an apocalyptic number.

It is an amenable number.

4028621 is a deficient number, since it is larger than the sum of its proper divisors (1).

4028621 is an equidigital number, since it uses as much as digits as its factorization.

4028621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 4028621 is about 2007.1424961871. The cubic root of 4028621 is about 159.1178141361.

The spelling of 4028621 in words is "four million, twenty-eight thousand, six hundred twenty-one".