743721 has 16 divisors (see below), whose sum is σ = 1118208. Its totient is φ = 435600.

The previous prime is 743711. The next prime is 743731. The reversal of 743721 is 127347.

743721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (743711) and next prime (743731).

It is not a de Polignac number, because 743721 - 2⁵ = 743689 is a prime.

743721 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 743691 and 743700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (743711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 660 + ... + 1386.

It is an arithmetic number, because the mean of its divisors is an integer number (69888).

2⁷⁴³⁷²¹ is an apocalyptic number.

It is an amenable number.

743721 is a deficient number, since it is larger than the sum of its proper divisors (374487).

743721 is a wasteful number, since it uses less digits than its factorization.

743721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772.

The product of its digits is 1176, while the sum is 24.

The square root of 743721 is about 862.3926020091. The cubic root of 743721 is about 90.6017698683.

The spelling of 743721 in words is "seven hundred forty-three thousand, seven hundred twenty-one", and thus it is an iban number.