4523721 has 4 divisors (see below), whose sum is σ = 6031632. Its totient is φ = 3015812.

The previous prime is 4523719. The next prime is 4523747. The reversal of 4523721 is 1273254.

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 4523721 - 2¹ = 4523719 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 4523691 and 4523700.

It is not an unprimeable number, because it can be changed into a prime (4523791) 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, 753951 + ... + 753956.

It is an arithmetic number, because the mean of its divisors is an integer number (1507908).

Almost surely, 2^4523721 is an apocalyptic number.

It is an amenable number.

4523721 is a deficient number, since it is larger than the sum of its proper divisors (1507911).

4523721 is a wasteful number, since it uses less digits than its factorization.

4523721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1507910.

The product of its digits is 1680, while the sum is 24.

The square root of 4523721 is about 2126.9040881055. The cubic root of 4523721 is about 165.3859468601.

Adding to 4523721 its reverse (1273254), we get a palindrome (5796975).

The spelling of 4523721 in words is "four million, five hundred twenty-three thousand, seven hundred twenty-one".