4640721 has 4 divisors (see below), whose sum is σ = 6187632. Its totient is φ = 3093812.

The previous prime is 4640719. The next prime is 4640723. The reversal of 4640721 is 1270464.

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 an interprime number because it is at equal distance from previous prime (4640719) and next prime (4640723).

It is a cyclic number.

It is not a de Polignac number, because 4640721 - 2¹ = 4640719 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 4640691 and 4640700.

It is not an unprimeable number, because it can be changed into a prime (4640723) 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, 773451 + ... + 773456.

It is an arithmetic number, because the mean of its divisors is an integer number (1546908).

Almost surely, 2^4640721 is an apocalyptic number.

It is an amenable number.

4640721 is a deficient number, since it is larger than the sum of its proper divisors (1546911).

4640721 is a wasteful number, since it uses less digits than its factorization.

4640721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546910.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 4640721 is about 2154.2332742765. The cubic root of 4640721 is about 166.7996569644.

The spelling of 4640721 in words is "four million, six hundred forty thousand, seven hundred twenty-one".