721132 has 12 divisors (see below), whose sum is σ = 1272040. Its totient is φ = 357696.

The previous prime is 721129. The next prime is 721139. The reversal of 721132 is 231127.

It is a happy number.

It is a super-2 number, since 2×721132² = 1040062722848, which contains 22 as substring.

It is an Ulam number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93 + ... + 1204.

2⁷²¹¹³² is an apocalyptic number.

It is an amenable number.

721132 is a deficient number, since it is larger than the sum of its proper divisors (550908).

721132 is a wasteful number, since it uses less digits than its factorization.

721132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1440 (or 1438 counting only the distinct ones).

The product of its digits is 84, while the sum is 16.

The square root of 721132 is about 849.1949128439. The cubic root of 721132 is about 89.6750420968.

Adding to 721132 its reverse (231127), we get a palindrome (952259).

The spelling of 721132 in words is "seven hundred twenty-one thousand, one hundred thirty-two".