721134 has 12 divisors (see below), whose sum is σ = 1562496. Its totient is φ = 240372.

The previous prime is 721129. The next prime is 721139. The reversal of 721134 is 431127.

It is an interprime number because it is at equal distance from previous prime (721129) and next prime (721139).

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 40063 = 721134 / (7 + 2 + 1 + 1 + 3 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721139) by changing a digit.

721134 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20014 + ... + 20049.

It is an arithmetic number, because the mean of its divisors is an integer number (130208).

2⁷²¹¹³⁴ is an apocalyptic number.

721134 is an abundant number, since it is smaller than the sum of its proper divisors (841362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721134 is a wasteful number, since it uses less digits than its factorization.

721134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40071 (or 40068 counting only the distinct ones).

The product of its digits is 168, while the sum is 18.

The square root of 721134 is about 849.1960904291. The cubic root of 721134 is about 89.6751249988.

The spelling of 721134 in words is "seven hundred twenty-one thousand, one hundred thirty-four".