4021669 has 4 divisors (see below), whose sum is σ = 4087660. Its totient is φ = 3955680.

The previous prime is 4021663. The next prime is 4021727. The reversal of 4021669 is 9661204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 580644 + 3441025 = 762^2 + 1855^2 .

It is a cyclic number.

It is not a de Polignac number, because 4021669 - 2¹⁹ = 3497381 is a prime.

It is a super-2 number, since 2×4021669² = 32347643091122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32904 + ... + 33025.

It is an arithmetic number, because the mean of its divisors is an integer number (1021915).

Almost surely, 2^4021669 is an apocalyptic number.

It is an amenable number.

4021669 is a deficient number, since it is larger than the sum of its proper divisors (65991).

4021669 is an equidigital number, since it uses as much as digits as its factorization.

4021669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65990.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 4021669 is about 2005.4099331558. The cubic root of 4021669 is about 159.0262340849.

The spelling of 4021669 in words is "four million, twenty-one thousand, six hundred sixty-nine".