4098721 has 4 divisors (see below), whose sum is σ = 4471344. Its totient is φ = 3726100.

The previous prime is 4098719. The next prime is 4098763. The reversal of 4098721 is 1278904.

4098721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 4098721 - 2¹ = 4098719 is a prime.

It is a Duffinian number.

4098721 is a lucky number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (4098701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186295 + ... + 186316.

It is an arithmetic number, because the mean of its divisors is an integer number (1117836).

Almost surely, 2^4098721 is an apocalyptic number.

It is an amenable number.

4098721 is a deficient number, since it is larger than the sum of its proper divisors (372623).

4098721 is a wasteful number, since it uses less digits than its factorization.

4098721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372622.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 4098721 is about 2024.5298219587. The cubic root of 4098721 is about 160.0354218450.

The spelling of 4098721 in words is "four million, ninety-eight thousand, seven hundred twenty-one".