4020689 has 4 divisors (see below), whose sum is σ = 4032624. Its totient is φ = 4008756.

The previous prime is 4020671. The next prime is 4020691. The reversal of 4020689 is 9860204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4020689 - 2⁸ = 4020433 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4020889) 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 3 ways as a sum of consecutive naturals, for example, 5447 + ... + 6140.

It is an arithmetic number, because the mean of its divisors is an integer number (1008156).

Almost surely, 2^4020689 is an apocalyptic number.

It is an amenable number.

4020689 is a deficient number, since it is larger than the sum of its proper divisors (11935).

4020689 is a wasteful number, since it uses less digits than its factorization.

4020689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11934.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 4020689 is about 2005.1655791979. The cubic root of 4020689 is about 159.0133158686.

The spelling of 4020689 in words is "four million, twenty thousand, six hundred eighty-nine".