735721 has 8 divisors (see below), whose sum is σ = 855104. Its totient is φ = 619920.

The previous prime is 735719. The next prime is 735731. The reversal of 735721 is 127537.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 735721 - 2¹ = 735719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (735731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 435 + ... + 1288.

It is an arithmetic number, because the mean of its divisors is an integer number (106888).

2⁷³⁵⁷²¹ is an apocalyptic number.

It is an amenable number.

735721 is a deficient number, since it is larger than the sum of its proper divisors (119383).

735721 is a wasteful number, since it uses less digits than its factorization.

735721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791.

The product of its digits is 1470, while the sum is 25.

The square root of 735721 is about 857.7418026423. The cubic root of 735721 is about 90.2757387013.

It can be divided in two parts, 735 and 721, that multiplied together give a triangular number (529935 = T₁₀₂₉).

The spelling of 735721 in words is "seven hundred thirty-five thousand, seven hundred twenty-one".