749721 has 16 divisors (see below), whose sum is σ = 1203200. Its totient is φ = 405648.

The previous prime is 749711. The next prime is 749729. The reversal of 749721 is 127947.

749721 is digitally balanced in base 2 and base 7, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 749721 - 2⁹ = 749209 is a prime.

It is a Duffinian number.

749721 is strictly pandigital in base 7.

It is not an unprimeable number, because it can be changed into a prime (749729) 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, 541 + ... + 1338.

It is an arithmetic number, because the mean of its divisors is an integer number (75200).

2⁷⁴⁹⁷²¹ is an apocalyptic number.

It is an amenable number.

749721 is a deficient number, since it is larger than the sum of its proper divisors (453479).

749721 is a wasteful number, since it uses less digits than its factorization.

749721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1908.

The product of its digits is 3528, while the sum is 30.

The square root of 749721 is about 865.8643080760. The cubic root of 749721 is about 90.8447620966.

The spelling of 749721 in words is "seven hundred forty-nine thousand, seven hundred twenty-one".