4021723 has 4 divisors (see below), whose sum is σ = 4151488. Its totient is φ = 3891960.

The previous prime is 4021663. The next prime is 4021727. The reversal of 4021723 is 3271204.

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

It is a cyclic number.

It is not a de Polignac number, because 4021723 - 2⁹ = 4021211 is a prime.

It is a d-powerful number, because it can be written as 4¹⁰ + 0 + 2¹⁵ + 1 + 7⁷ + 2²¹ + 3⁹ .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4021723.

It is not an unprimeable number, because it can be changed into a prime (4021727) 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, 64836 + ... + 64897.

It is an arithmetic number, because the mean of its divisors is an integer number (1037872).

Almost surely, 2^4021723 is an apocalyptic number.

4021723 is a deficient number, since it is larger than the sum of its proper divisors (129765).

4021723 is a wasteful number, since it uses less digits than its factorization.

4021723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129764.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 4021723 is about 2005.4233966921. The cubic root of 4021723 is about 159.0269458439.

Adding to 4021723 its reverse (3271204), we get a palindrome (7292927).

The spelling of 4021723 in words is "four million, twenty-one thousand, seven hundred twenty-three".