4093721 has 4 divisors (see below), whose sum is σ = 4309200. Its totient is φ = 3878244.

The previous prime is 4093709. The next prime is 4093751. The reversal of 4093721 is 1273904.

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 4093721 - 2¹⁸ = 3831577 is a prime.

It is a super-3 number, since 3×4093721³ (a number of 21 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (4093751) 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, 107711 + ... + 107748.

It is an arithmetic number, because the mean of its divisors is an integer number (1077300).

Almost surely, 2^4093721 is an apocalyptic number.

It is an amenable number.

4093721 is a deficient number, since it is larger than the sum of its proper divisors (215479).

4093721 is a wasteful number, since it uses less digits than its factorization.

4093721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215478.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 4093721 is about 2023.2945905132. The cubic root of 4093721 is about 159.9703200155.

The spelling of 4093721 in words is "four million, ninety-three thousand, seven hundred twenty-one".