731934721 has 8 divisors (see below), whose sum is σ = 837220544. Its totient is φ = 626829840.

The previous prime is 731934667. The next prime is 731934761. The reversal of 731934721 is 127439137.

It is a happy number.

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

It is not a de Polignac number, because 731934721 - 2¹¹ = 731932673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (731934761) 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, 36450 + ... + 52843.

It is an arithmetic number, because the mean of its divisors is an integer number (104652568).

Almost surely, 2^731934721 is an apocalyptic number.

It is an amenable number.

731934721 is a deficient number, since it is larger than the sum of its proper divisors (105285823).

731934721 is a wasteful number, since it uses less digits than its factorization.

731934721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90471.

The product of its digits is 31752, while the sum is 37.

The square root of 731934721 is about 27054.2920994063. The cubic root of 731934721 is about 901.2060871197.

It can be divided in two parts, 731934 and 721, that added together give a triangular number (732655 = T₁₂₁₀).

The spelling of 731934721 in words is "seven hundred thirty-one million, nine hundred thirty-four thousand, seven hundred twenty-one".