140721 has 8 divisors (see below), whose sum is σ = 214464. Its totient is φ = 80400.

The previous prime is 140717. The next prime is 140729. The reversal of 140721 is 127041.

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

It is not a de Polignac number, because 140721 - 2² = 140717 is a prime.

140721 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 140721.

It is not an unprimeable number, because it can be changed into a prime (140729) 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, 3330 + ... + 3371.

It is an arithmetic number, because the mean of its divisors is an integer number (26808).

2¹⁴⁰⁷²¹ is an apocalyptic number.

It is an amenable number.

140721 is a deficient number, since it is larger than the sum of its proper divisors (73743).

140721 is an equidigital number, since it uses as much as digits as its factorization.

140721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6711.

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 140721 is about 375.1279781621. The cubic root of 140721 is about 52.0139262503.

Adding to 140721 its reverse (127041), we get a palindrome (267762).

It can be divided in two parts, 140 and 721, that added together give a triangular number (861 = T₄₁).

The spelling of 140721 in words is "one hundred forty thousand, seven hundred twenty-one", and thus it is an iban number.